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Full vulnerability report · 2021
CVE-2021-23840High confidence

Integer overflow in CipherUpdate

OpenSSL · OpenSSL

7.5HighCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:Critical, raised one band.upgradedsince 5 Oct 2026

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 50.73% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs OpenSSL OpenSSL and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

Alpine, Debian findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

7 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Alpine v3.23v3.23 · mainopensslVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.1.1.1j-r0Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.22v3.22 · mainopensslVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.1.1.1j-r0Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.21v3.21 · mainopensslVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.1.1.1j-r0Alpine Security Database ↗Source updated 3 Oct 2026
Debian trixietrixie · sourceopensslVendor fix publishedDebian records a fixed source-package version for this release.1.1.1j-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourceopensslVendor fix publishedDebian records a fixed source-package version for this release.1.1.1j-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourceopensslVendor fix publishedDebian records a fixed source-package version for this release.1.1.1j-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourceopensslVendor fix publishedDebian records a fixed source-package version for this release.1.1.1j-1Debian Security Tracker ↗Source updated 5 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

2 current
CVE-2021-23840 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityopenssl: integer overflow in CipherUpdate
5 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • management-ingress.src as a component of Red Hat Advanced Cluster Management for Kubernetes 2
  • AAVMF as a component of Red Hat Enterprise Linux 7
  • OVMF as a component of Red Hat Enterprise Linux 7
  • ovmf.src as a component of Red Hat Enterprise Linux 7
  • openssl.src as a component of Red Hat JBoss Enterprise Application Platform 6
Summary
Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissible length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative. This could cause applications to behave incorrectly or crash.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 For the update to take effect, all services linked to the OpenSSL library must be restarted, or the system rebooted.
SSA-389290 · CSAF 2.0 · revision 1 · finalSiemens ProductCERTSSA-389290: Third-Party Component Vulnerabilities in SINEC INS
1 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • SINEC INS
Summary
Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissable length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative. This could cause applications to behave incorrectly or crash. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).
Remediation
Update to V1.0.1.1 or later version
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2021-1843

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissable length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative. This could cause applications to behave incorrectly or crash. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).

What

Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissable length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative. This could cause applications to behave incorrectly or crash. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).

Why

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissable length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative. This could cause applications to behave incorrectly or crash. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).

Why

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Integer Overflow or Wraparound → disrupt the affected service
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-190 ↗

CWE-190: Integer Overflow or Wraparound. The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedDenial of serviceCWE-190
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2026-0180Dell Data Protection Advisor: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Dell Data Protection Advisor ausnutzen, um beliebigen Code auszuführen, einen Denial-of-Service-Zustand zu erzeugen, Sicherheitsmaßnahmen zu umgehen und nicht näher spezifizierte Angriffe zu starten.

Official advisory ↗
BSI · German · WID-SEC-2024-0794Dell ECS: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Dell ECS ausnutzen, um seine Privilegien zu erweitern, beliebigen Programmcode mit Administratorrechten auszuführen, Informationen offenzulegen, Dateien zu manipulieren, einen Cross-Site-Scripting-Angriff durchzuführen, Sicherheitsvorkehrungen zu umgehen oder einen Denial of Service Zustand herbeizuführen.

Official advisory ↗
BSI · German · WID-SEC-2022-0676Juniper Junos Space: Mehrere Schwachstellen

Ein entfernter, anonymer, authentisierter oder lokaler Angreifer kann mehrere Schwachstellen in Juniper Junos Space ausnutzen, um einen Denial-of-Service-Zustand herbeizuführen, vertrauliche Informationen offenzulegen, Daten zu manipulieren oder zu verändern, seine Privilegien zu erweitern und Sicherheitsmaßnahmen zu umgehen.

Official advisory ↗
BSI · German · WID-SEC-2022-0602IBM Security Verify Access: Mehrere Schwachstellen

Ein entfernter anonymer, authentisierter oder lokaler Angreifer oder ein Angreifer aus dem angrenzenden Netzwerk kann mehrere Schwachstellen in IBM Security Verify Access ausnutzen, um einen Cross-Site-Scripting-Angriff durchzuführen, vertrauliche Informationen offenzulegen, seine Privilegien zu erweitern, Informationen zu manipulieren, einen Denial-of-Service-Zustand zu verursachen und Sicherheitsmaßnahmen zu umgehen.

Official advisory ↗
BSI · German · WID-SEC-2022-0669OpenSSL: Mehrere Schwachstellen

Ein entfernter, anonymer oder lokaler Angreifer kann mehrere Schwachstellen in OpenSSL ausnutzen, um Sicherheitsvorkehrungen zu umgehen oder einen Denial of Service Zustand herzustellen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20210217Security Bulletin 17 Feb 2021

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 17 Feb 2021, published on 17 February 2021. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0326Multiples vulnérabilités dans les produits VMware

rg/CVERecord?id=CVE-2021-0173 Référence CVE CVE-2021-0174 https://www.cve.org/CVERecord?id=CVE-2021-0174 Référence CVE CVE-2021-0175 https://www.cve.org/CVERecord?id=CVE-2021-0175 Référence CVE CVE-2021-0176 https://www.cve.org/CVERecord?id=CVE-2021-0176 Référence CVE CVE-2021-0183 https://www.cve.org/CVERecord?id=CVE-2021-0183 Référence CVE CVE-2021-0308 https://www.cve.org/CVERecord?id=CVE-2021-0308 Référence CVE CVE-2021-20255 https://www.cve.org/CVERecord?id=CVE-2021-20255 Référence CVE CVE-2021-21240 https://www.cve.org/CVERecord?id=CVE-2021-21240 Référence CVE CVE-2021-22930 https://www.cve.org/CVERecord?id=CVE-2021-22930 Référence CVE CVE-2021-23840 https://www.cve.org/CVERecord?id=CVE-2021-23840 Référence CVE CVE-2021-26934 https://www.cve.org/CVERecord?id=CVE-2021-26934 Référence CVE CVE-2021-31615 https://www.cve.org/CVERecord?id=CVE-2021-31615 Référence CVE CVE-2021-31879 https://www.cve.org/CVERecord?id=CVE-2021-31879 Référence CVE CVE-2021-33096 https://www.cve.org/CVERecord?id=CVE-2021-33096 Référence CVE CVE-2021-33110 https://www.cve.org/CVERecord?id=CVE-2021-33110 Référence CVE CVE-2021-33113 https://www.cve.org/CVERecord?id=CVE-2021-33113 Référence CVE CVE-2021-33114 https://www.cve.org/CVERecord?id=CVE-2021-33114 Référence CVE CVE-2021-33115 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0316Multiples vulnérabilités dans les produits VMware

rg/CVERecord?id=CVE-2021-0173 Référence CVE CVE-2021-0174 https://www.cve.org/CVERecord?id=CVE-2021-0174 Référence CVE CVE-2021-0175 https://www.cve.org/CVERecord?id=CVE-2021-0175 Référence CVE CVE-2021-0176 https://www.cve.org/CVERecord?id=CVE-2021-0176 Référence CVE CVE-2021-0183 https://www.cve.org/CVERecord?id=CVE-2021-0183 Référence CVE CVE-2021-0308 https://www.cve.org/CVERecord?id=CVE-2021-0308 Référence CVE CVE-2021-20255 https://www.cve.org/CVERecord?id=CVE-2021-20255 Référence CVE CVE-2021-21240 https://www.cve.org/CVERecord?id=CVE-2021-21240 Référence CVE CVE-2021-22930 https://www.cve.org/CVERecord?id=CVE-2021-22930 Référence CVE CVE-2021-23840 https://www.cve.org/CVERecord?id=CVE-2021-23840 Référence CVE CVE-2021-26934 https://www.cve.org/CVERecord?id=CVE-2021-26934 Référence CVE CVE-2021-31615 https://www.cve.org/CVERecord?id=CVE-2021-31615 Référence CVE CVE-2021-31879 https://www.cve.org/CVERecord?id=CVE-2021-31879 Référence CVE CVE-2021-33096 https://www.cve.org/CVERecord?id=CVE-2021-33096 Référence CVE CVE-2021-33110 https://www.cve.org/CVERecord?id=CVE-2021-33110 Référence CVE CVE-2021-33113 https://www.cve.org/CVERecord?id=CVE-2021-33113 Référence CVE CVE-2021-33114 https://www.cve.org/CVERecord?id=CVE-2021-33114 Référence CVE CVE-2021-33115 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0199Multiples vulnérabilités dans les produits VMware

rd?id=CVE-2020-8908 Référence CVE CVE-2021-22897 https://www.cve.org/CVERecord?id=CVE-2021-22897 Référence CVE CVE-2021-22898 https://www.cve.org/CVERecord?id=CVE-2021-22898 Référence CVE CVE-2021-22922 https://www.cve.org/CVERecord?id=CVE-2021-22922 Référence CVE CVE-2021-22923 https://www.cve.org/CVERecord?id=CVE-2021-22923 Référence CVE CVE-2021-22925 https://www.cve.org/CVERecord?id=CVE-2021-22925 Référence CVE CVE-2021-22926 https://www.cve.org/CVERecord?id=CVE-2021-22926 Référence CVE CVE-2021-22946 https://www.cve.org/CVERecord?id=CVE-2021-22946 Référence CVE CVE-2021-22947 https://www.cve.org/CVERecord?id=CVE-2021-22947 Référence CVE CVE-2021-23840 https://www.cve.org/CVERecord?id=CVE-2021-23840 Référence CVE CVE-2021-23841 https://www.cve.org/CVERecord?id=CVE-2021-23841 Référence CVE CVE-2021-3449 https://www.cve.org/CVERecord?id=CVE-2021-3449 Référence CVE CVE-2021-3711 https://www.cve.org/CVERecord?id=CVE-2021-3711 Référence CVE CVE-2021-3712 https://www.cve.org/CVERecord?id=CVE-2021-3712 Référence CVE CVE-2021-37600 https://www.cve.org/CVERecord?id=CVE-2021-37600 Référence CVE CVE-2021-38297 https://www.cve.org/CVERecord?id=CVE-2021-38297 Référence CVE CVE-2021-38561 https://www.cve.org/CVERecord?id=CVE-2021-38561 Référence CVE CVE-2021-39293 https://www.cve.org/CVERecord?id=CVE-20

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0180Multiples vulnérabilités dans les produits IBM

rg/CVERecord?id=CVE-2012-5784 Référence CVE CVE-2014-3596 https://www.cve.org/CVERecord?id=CVE-2014-3596 Référence CVE CVE-2018-8032 https://www.cve.org/CVERecord?id=CVE-2018-8032 Référence CVE CVE-2019-0227 https://www.cve.org/CVERecord?id=CVE-2019-0227 Référence CVE CVE-2019-1547 https://www.cve.org/CVERecord?id=CVE-2019-1547 Référence CVE CVE-2020-1971 https://www.cve.org/CVERecord?id=CVE-2020-1971 Référence CVE CVE-2020-28458 https://www.cve.org/CVERecord?id=CVE-2020-28458 Référence CVE CVE-2021-23445 https://www.cve.org/CVERecord?id=CVE-2021-23445 Référence CVE CVE-2021-23839 https://www.cve.org/CVERecord?id=CVE-2021-23839 Référence CVE CVE-2021-23840 https://www.cve.org/CVERecord?id=CVE-2021-23840 Référence CVE CVE-2021-23841 https://www.cve.org/CVERecord?id=CVE-2021-23841 Référence CVE CVE-2021-28167 https://www.cve.org/CVERecord?id=CVE-2021-28167 Référence CVE CVE-2021-31684 https://www.cve.org/CVERecord?id=CVE-2021-31684 Référence CVE CVE-2021-3449 https://www.cve.org/CVERecord?id=CVE-2021-3449 Référence CVE CVE-2021-35550 https://www.cve.org/CVERecord?id=CVE-2021-35550 Référence CVE CVE-2021-35556 https://www.cve.org/CVERecord?id=CVE-2021-35556 Référence CVE CVE-2021-35559 https://www.cve.org/CVERecord?id=CVE-2021-35559 Référence CVE CVE-2021-35560 https://www.cve.org/CVERecord?id=CV

Official advisory ↗
CERT-FR · French · CERTFR-2023-AVI-0051Multiples vulnérabilités dans les produits Juniper

rg/CVERecord?id=CVE-2021-2226 Référence CVE CVE-2021-22543 https://www.cve.org/CVERecord?id=CVE-2021-22543 Référence CVE CVE-2021-22555 https://www.cve.org/CVERecord?id=CVE-2021-22555 Référence CVE CVE-2021-23017 https://www.cve.org/CVERecord?id=CVE-2021-23017 Référence CVE CVE-2021-2307 https://www.cve.org/CVERecord?id=CVE-2021-2307 Référence CVE CVE-2021-2341 https://www.cve.org/CVERecord?id=CVE-2021-2341 Référence CVE CVE-2021-2342 https://www.cve.org/CVERecord?id=CVE-2021-2342 Référence CVE CVE-2021-2369 https://www.cve.org/CVERecord?id=CVE-2021-2369 Référence CVE CVE-2021-2372 https://www.cve.org/CVERecord?id=CVE-2021-2372 Référence CVE CVE-2021-23840 https://www.cve.org/CVERecord?id=CVE-2021-23840 Référence CVE CVE-2021-23841 https://www.cve.org/CVERecord?id=CVE-2021-23841 Référence CVE CVE-2021-2385 https://www.cve.org/CVERecord?id=CVE-2021-2385 Référence CVE CVE-2021-2388 https://www.cve.org/CVERecord?id=CVE-2021-2388 Référence CVE CVE-2021-2389 https://www.cve.org/CVERecord?id=CVE-2021-2389 Référence CVE CVE-2021-2390 https://www.cve.org/CVERecord?id=CVE-2021-2390 Référence CVE CVE-2021-2432 https://www.cve.org/CVERecord?id=CVE-2021-2432 Référence CVE CVE-2021-25217 https://www.cve.org/CVERecord?id=CVE-2021-25217 Référence CVE CVE-2021-26691 https://www.cve.org/CVERecord?id=CVE-2021-2

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-916Multiples vulnérabilités dans les produits Juniper

CVERecord?id=CVE-2020-29661 Référence CVE CVE-2020-7053 https://www.cve.org/CVERecord?id=CVE-2020-7053 Référence CVE CVE-2020-8648 https://www.cve.org/CVERecord?id=CVE-2020-8648 Référence CVE CVE-2021-0543 https://www.cve.org/CVERecord?id=CVE-2021-0543 Référence CVE CVE-2021-0920 https://www.cve.org/CVERecord?id=CVE-2021-0920 Référence CVE CVE-2021-20265 https://www.cve.org/CVERecord?id=CVE-2021-20265 Référence CVE CVE-2021-20271 https://www.cve.org/CVERecord?id=CVE-2021-20271 Référence CVE CVE-2021-22543 https://www.cve.org/CVERecord?id=CVE-2021-22543 Référence CVE CVE-2021-22555 https://www.cve.org/CVERecord?id=CVE-2021-22555 Référence CVE CVE-2021-23840 https://www.cve.org/CVERecord?id=CVE-2021-23840 Référence CVE CVE-2021-25220 https://www.cve.org/CVERecord?id=CVE-2021-25220 Référence CVE CVE-2021-27363 https://www.cve.org/CVERecord?id=CVE-2021-27363 Référence CVE CVE-2021-27364 https://www.cve.org/CVERecord?id=CVE-2021-27364 Référence CVE CVE-2021-27365 https://www.cve.org/CVERecord?id=CVE-2021-27365 Référence CVE CVE-2021-28165 https://www.cve.org/CVERecord?id=CVE-2021-28165 Référence CVE CVE-2021-29154 https://www.cve.org/CVERecord?id=CVE-2021-29154 Référence CVE CVE-2021-29650 https://www.cve.org/CVERecord?id=CVE-2021-29650 Référence CVE CVE-2021-31535 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-650Multiples vulnérabilités dans les produits Juniper

VERecord?id=CVE-2020-8616 Référence CVE CVE-2020-8617 https://www.cve.org/CVERecord?id=CVE-2020-8617 Référence CVE CVE-2020-8840 https://www.cve.org/CVERecord?id=CVE-2020-8840 Référence CVE CVE-2020-9327 https://www.cve.org/CVERecord?id=CVE-2020-9327 Référence CVE CVE-2021-20227 https://www.cve.org/CVERecord?id=CVE-2021-20227 Référence CVE CVE-2021-20271 https://www.cve.org/CVERecord?id=CVE-2021-20271 Référence CVE CVE-2021-22946 https://www.cve.org/CVERecord?id=CVE-2021-22946 Référence CVE CVE-2021-23017 https://www.cve.org/CVERecord?id=CVE-2021-23017 Référence CVE CVE-2021-23839 https://www.cve.org/CVERecord?id=CVE-2021-23839 Référence CVE CVE-2021-23840 https://www.cve.org/CVERecord?id=CVE-2021-23840 Référence CVE CVE-2021-23841 https://www.cve.org/CVERecord?id=CVE-2021-23841 Référence CVE CVE-2021-28950 https://www.cve.org/CVERecord?id=CVE-2021-28950 Référence CVE CVE-2021-3177 https://www.cve.org/CVERecord?id=CVE-2021-3177 Référence CVE CVE-2021-33574 https://www.cve.org/CVERecord?id=CVE-2021-33574 Référence CVE CVE-2021-3487 https://www.cve.org/CVERecord?id=CVE-2021-3487 Référence CVE CVE-2021-3517 https://www.cve.org/CVERecord?id=CVE-2021-3517 Référence CVE CVE-2021-3520 https://www.cve.org/CVERecord?id=CVE-2021-3520 Référence CVE CVE-2021-35550 https://www.cve.org/CVERecord?id=CVE-2021

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-272Multiples vulnérabilités dans IBM QRadar

De multiples vulnérabilités ont été découvertes dans IBM QRadar. Elles permettent à un attaquant de provoquer un déni de service à distance.

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-216Multiples vulnérabilités dans les produits Siemens

d?id=CVE-2021-22926 Référence CVE CVE-2021-22930 https://www.cve.org/CVERecord?id=CVE-2021-22930 Référence CVE CVE-2021-22931 https://www.cve.org/CVERecord?id=CVE-2021-22931 Référence CVE CVE-2021-22939 https://www.cve.org/CVERecord?id=CVE-2021-22939 Référence CVE CVE-2021-22940 https://www.cve.org/CVERecord?id=CVE-2021-22940 Référence CVE CVE-2021-22945 https://www.cve.org/CVERecord?id=CVE-2021-22945 Référence CVE CVE-2021-22946 https://www.cve.org/CVERecord?id=CVE-2021-22946 Référence CVE CVE-2021-22947 https://www.cve.org/CVERecord?id=CVE-2021-22947 Référence CVE CVE-2021-23362 https://www.cve.org/CVERecord?id=CVE-2021-23362 Référence CVE CVE-2021-23840 https://www.cve.org/CVERecord?id=CVE-2021-23840 Référence CVE CVE-2021-25173 https://www.cve.org/CVERecord?id=CVE-2021-25173 Référence CVE CVE-2021-25174 https://www.cve.org/CVERecord?id=CVE-2021-25174 Référence CVE CVE-2021-25175 https://www.cve.org/CVERecord?id=CVE-2021-25175 Référence CVE CVE-2021-25176 https://www.cve.org/CVERecord?id=CVE-2021-25176 Référence CVE CVE-2021-25177 https://www.cve.org/CVERecord?id=CVE-2021-25177 Référence CVE CVE-2021-25178 https://www.cve.org/CVERecord?id=CVE-2021-25178 Référence CVE CVE-2021-25214 https://www.cve.org/CVERecord?id=CVE-2021-25214 Référence CVE CVE-2021-25215 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-054Multiples vulnérabilités dans Oracle Systems

De multiples vulnérabilités ont été découvertes dans Oracle Systems. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un déni de service à distance et une atteinte à l'intégrité des données.

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-430Multiples vulnérabilités dans Tenable LCE

De multiples vulnérabilités ont été découvertes dans Tenable LCE. Elles permettent à un attaquant de provoquer une exécution de code arbitraire, un déni de service à distance et un contournement de la politique de sécurité.

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-395Multiples vulnérabilités dans IBM Spectrum Control

d?id=CVE-2021-21345 Référence CVE CVE-2021-21346 https://www.cve.org/CVERecord?id=CVE-2021-21346 Référence CVE CVE-2021-21347 https://www.cve.org/CVERecord?id=CVE-2021-21347 Référence CVE CVE-2021-21348 https://www.cve.org/CVERecord?id=CVE-2021-21348 Référence CVE CVE-2021-21349 https://www.cve.org/CVERecord?id=CVE-2021-21349 Référence CVE CVE-2021-21350 https://www.cve.org/CVERecord?id=CVE-2021-21350 Référence CVE CVE-2021-21351 https://www.cve.org/CVERecord?id=CVE-2021-21351 Référence CVE CVE-2021-22883 https://www.cve.org/CVERecord?id=CVE-2021-22883 Référence CVE CVE-2021-22884 https://www.cve.org/CVERecord?id=CVE-2021-22884 Référence CVE CVE-2021-23840 https://www.cve.org/CVERecord?id=CVE-2021-23840 Référence CVE CVE-2021-26296 https://www.cve.org/CVERecord?id=CVE-2021-26296 Référence CVE CVE-2021-3449 https://www.cve.org/CVERecord?id=CVE-2021-3449 Référence CVE CVE-2021-3450 https://www.cve.org/CVERecord?id=CVE-2021-3450 Gestion détaillée du document le 21 mai 2021 Version initiale Alertes Avis Bulletins d’actualités Mentions légales Conditions générales À propos Contact cyber.gouv.fr service-public.fr legifrance.gouv.fr info.gouv.fr france.fr info.gouv.fr/risques Premier Ministre / Secrétariat Général de la Défense et de la Sécurité Nationale / Agence nationale de la sécurité des système

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-374Multiples vulnérabilités dans Tenable Nessus

De multiples vulnérabilités ont été découvertes dans Tenable Nessus. Elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur, un déni de service à distance et un contournement de la politique de sécurité.

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-313Multiples vulnérabilités dans Stormshield Management Center

De multiples vulnérabilités ont été découvertes dans Stormshield Management Center. Elles permettent à un attaquant de provoquer un déni de service à distance.

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-208Multiples vulnérabilités dans Tenable Nessus Agent

De multiples vulnérabilités ont été découvertes dans Tenable Nessus Agent. Elles permettent à un attaquant de provoquer un déni de service à distance et une atteinte à la confidentialité des données.

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-157Multiples vulnérabilités dans Tenable.sc

De multiples vulnérabilités ont été découvertes dans les produits Tenable. Elles permettent à un attaquant authentifié de provoquer une exécution de code arbitraire à distance et un dénis de service.

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-124Multiples vulnérabilités dans OpenSSL

De multiples vulnérabilités ont été découvertes dans OpenSSL. Elles permettent à un attaquant de provoquer un déni de service.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-004775OpenSSL における整数オーバーフローの脆弱性

OpenSSL には、入力長がプラットフォーム上の整数の最大許容長に近い場合、EVP_CipherUpdate、EVP_EncryptUpdate、EVP_DecryptUpdate の呼び出しに不備があるため、整数オーバーフローの脆弱性が存在します。

Official advisory ↗
NCSC-NL · Dutch · NCSC-2024-0239Kwetsbaarheden verholpen in Solarwinds Platform

Een kwaadwillende kan de kwetsbaarheden misbruiken om een Denial-of-Service te veroorzaken, een command-injection uit te voeren, of om een Cross-Site-Scripting-aanval uit te voeren. Een dergelijke aanval kan leiden tot uitvoer van willekeurige code in de browser van het slachtoffer. Voor succesvol misbruik moet de kwaadwillende voorafgaande authenticatie hebben.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix availability varies by product
Affected
Fixed
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 16 Feb 2021 · Last source change 16 Apr 2026, 14:12 UTC · CWE-190 · Integer Overflow or Wraparound

CVE recordCVE.org · 5.2
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2021-1843
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCISA ADP
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i); Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x) · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i); Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x) · Fixed: Update to V1.0.1.1 or later version
    Siemens ProductCERT ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2021-1843↗Vendor CSAF · Red Hat Product Security↗Siemens ProductCERT security advisory↗CVE authority or vendor reference↗Patch or update reference↗Patch or update reference↗Patch or update reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2021-23840 · cve.blacktree.nl