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Full vulnerability report · 2021
CVE-2021-31895High confidence

Siemens RUGGEDCOM i800 — Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Siemens · RUGGEDCOM i800

Official source article: Siemens SSA-373591 ↗. Check the applicable product and release in the original source.

8.1HighCVSS 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 69 structured product or package states 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:High, unchanged from published severity.unchanged

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 2.20% 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 Siemens RUGGEDCOM i800 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 30 daysRemediation target: Within 180 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 69 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

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.

1 current
SSA-373591 · CSAF 2.0 · revision 3 · interimSiemens ProductCERTSSA-373591: Buffer Overflow Vulnerability in RUGGEDCOM ROS Devices
69 known affected

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

  • RUGGEDCOM i800
  • RUGGEDCOM i801
  • RUGGEDCOM i802
  • RUGGEDCOM i803
  • RUGGEDCOM M2100
  • RUGGEDCOM M2200
  • RUGGEDCOM M969
  • RUGGEDCOM RMC30
  • RUGGEDCOM RMC8388 V4.X
  • RUGGEDCOM RMC8388 V5.X
  • RUGGEDCOM RP110
  • RUGGEDCOM RS1600
Summary
The DHCP client in affected devices fails to properly sanitize incoming DHCP packets. This could allow an unauthenticated remote attacker to cause memory to be overwritten, potentially allowing remote code execution.
Remediation
Update to V4.3.7 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-2021-18770

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 69 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

A vulnerability has been identified in RUGGEDCOM i800 (All versions < V4.3.7), RUGGEDCOM i801 (All versions < V4.3.7), RUGGEDCOM i802 (All versions < V4.3.7), RUGGEDCOM i803 (All versions < V4.3.7), RUGGEDCOM M2100 (All versions < V4.3.7), RUGGEDCOM M2200 (All versions < V4.3.7), RUGGEDCOM M969 (All versions < V4.3.7), RUGGEDCOM RMC30 (All versions < V4.3.7), RUGGEDCOM RMC8388 V4.X (All versions < V4.3.7), RUGGEDCOM RMC8388 V5.X (All versions < V5.5.4), RUGGEDCOM RP110 (All versions < V4.3.7), RUGGEDCOM RS1600 (All versions < V4.3.7), RUGGEDCOM RS1600F (All versions < V4.3.7), RUGGEDCOM RS1600T (All versions < V4.3.7), RUGGEDCOM RS400 (All versions < V4.3.7), RUGGEDCOM RS401 (All versions < V4.3.7), RUGGEDCOM RS416 (All versions < V4.3.7), RUGGEDCOM RS416P (All versions < V4.3.7), RUGGEDCOM RS416Pv2 V4.X (All versions < V4.3.7), RUGGEDCOM RS416Pv2 V5.X (All versions < V5.5.4), RUGGEDCOM RS416v2 V4.X (All versions < V4.3.7), RUGGEDCOM RS416v2 V5.X (All versions < 5.5.4), RUGGEDCOM RS8000 (All versions < V4.3.7), RUGGEDCOM RS8000A (All versions < V4.3.7), RUGGEDCOM RS8000H (All versions < V4.3.7), RUGGEDCOM RS8000T (All versions < V4.3.7), RUGGEDCOM RS900 (32M) V4.X (All versions < V4.3.7), RUGGEDCOM RS900 (32M) V5.X (All versions < V5.5.4), RUGGEDCOM RS900G (All versions < V4.3.7), RUGGEDCOM RS900G (32M) V4.X (All versions < V4.3.7), RUGGEDCOM RS900G (32M) V5.X (All versions < V5.5.4), RUGGEDCOM RS900GP (All versions < V4.3.7), RUGGEDCOM RS900L (All versions < V4.3.7), RUGGEDCOM RS900W (All versions < V4.3.7), RUGGEDCOM RS910 (All versions < V4.3.7), RUGGEDCOM RS910L (All versions < V4.3.7), RUGGEDCOM RS910W (All versions < V4.3.7), RUGGEDCOM RS920L (All versions < V4.3.7), RUGGEDCOM RS920W (All versions < V4.3.7), RUGGEDCOM RS930L (All versions < V4.3.7), RUGGEDCOM RS930W (All versions < V4.3.7), RUGGEDCOM RS940G (All versions < V4.3.7), RUGGEDCOM RS969 (All versions < V4.3.7), RUGGEDCOM RSG2100 (All versions < V4.3.7), RUGGEDCOM RSG2100 (32M) V4.X (All versions < V4.3.7), RUGGEDCOM RSG2100 (32M) V5.X (All versions < V5.5.4), RUGGEDCOM RSG2100P (All versions < V4.3.7), RUGGEDCOM RSG2100P (32M) V4.X (All versions < V4.3.7), RUGGEDCOM RSG2100P (32M) V5.X (All versions < V5.5.4), RUGGEDCOM RSG2200 (All versions < V4.3.7), RUGGEDCOM RSG2288 V4.X (All versions < V4.3.7), RUGGEDCOM RSG2288 V5.X (All versions < V5.5.4), RUGGEDCOM RSG2300 V4.X (All versions < V4.3.7), RUGGEDCOM RSG2300 V5.X (All versions < V5.5.4), RUGGEDCOM RSG2300P V4.X (All versions < V4.3.7), RUGGEDCOM RSG2300P V5.X (All versions < V5.5.4), RUGGEDCOM RSG2488 V4.X (All versions < V4.3.7), RUGGEDCOM RSG2488 V5.X (All versions < V5.5.4), RUGGEDCOM RSG907R (All versions < V5.5.4), RUGGEDCOM RSG908C (All versions < V5.5.4), RUGGEDCOM RSG909R (All versions < V5.5.4), RUGGEDCOM RSG910C (All versions < V5.5.4), RUGGEDCOM RSG920P V4.X (All versions < V4.3.7), RUGGEDCOM RSG920P V5.X (All versions < V5.5.4), RUGGEDCOM RSL910 (All versions < V5.5.4), RUGGEDCOM RST2228 (All versions < V5.5.4), RUGGEDCOM RST2228P (All versions < V5.5.4), RUGGEDCOM RST916C (All versions < V5.5.4), RUGGEDCOM RST916P (All versions < V5.5.4). The DHCP client in affected devices fails to properly sanitize incoming DHCP packets. This could allow an unauthenticated remote attacker to cause memory to be overwritten, potentially allowing remote code execution.

What

A vulnerability has been identified in RUGGEDCOM i800 (All versions < V4.3.7), RUGGEDCOM i801 (All versions < V4.3.7), RUGGEDCOM i802 (All versions < V4.3.7), RUGGEDCOM i803 (All versions < V4.3.7), RUGGEDCOM M2100 (All versions < V4.3.7), RUGGEDCOM M2200 (All versions < V4.3.7), RUGGEDCOM M969 (All versions < V4.3.7), RUGGEDCOM RMC30 (All versions < V4.3.7), RUGGEDCOM RMC8388 V4.X (All versions < V4.3.7), RUGGEDCOM RMC8388 V5.X (All versions < V5.5.4), RUGGEDCOM RP110 (All versions < V4.3.7), RUGGEDCOM RS1600 (All versions < V4.3.7), RUGGEDCOM RS1600F (All versions < V4.3.7), RUGGEDCOM RS1600T (All versions < V4.3.7), RUGGEDCOM RS400 (All versions < V4.3.7), RUGGEDCOM RS401 (All versions < V4.3.7), RUGGEDCOM RS416 (All versions < V4.3.7), RUGGEDCOM RS416P (All versions < V4.3.7), RUGGEDCOM RS416Pv2 V4.X (All versions < V4.3.7), RUGGEDCOM RS416Pv2 V5.X (All versions < V5.5.4), RUGGEDCOM RS416v2 V4.X (All versions < V4.3.7), RUGGEDCOM RS416v2 V5.X (All versions < 5.5.4), RUGGEDCOM RS8000 (All versions < V4.3.7), RUGGEDCOM RS8000A (All versions < V4.3.7), RUGGEDCOM RS8000H (All versions < V4.3.7), RUGGEDCOM RS8000T (All versions < V4.3.7), RUGGEDCOM RS900 (32M) V4.X (All versions < V4.3.7), RUGGEDCOM RS900 (32M) V5.X (All versions < V5.5.4), RUGGEDCOM RS900G (All versions < V4.3.7), RUGGEDCOM RS900G (32M) V4.X (All versions < V4.3.7), RUGGEDCOM RS900G (32M) V5.X (All versions < V5.5.4), RUGGEDCOM RS900GP (All versions < V4.3.7), RUGGEDCOM RS900L (All versions < V4.3.7), RUGGEDCOM RS900W (All versions < V4.3.7), RUGGEDCOM RS910 (All versions < V4.3.7), RUGGEDCOM RS910L (All versions < V4.3.7), RUGGEDCOM RS910W (All versions < V4.3.7), RUGGEDCOM RS920L (All versions < V4.3.7), RUGGEDCOM RS920W (All versions < V4.3.7), RUGGEDCOM RS930L (All versions < V4.3.7), RUGGEDCOM RS930W (All versions < V4.3.7), RUGGEDCOM RS940G (All versions < V4.3.7), RUGGEDCOM RS969 (All versions < V4.3.7), RUGGEDCOM RSG2100 (All versions < V4.3.7), RUGGEDCOM RSG2100 (32M) V4.X (All versions < V4.3.7), RUGGEDCOM RSG2100 (32M) V5.X (All versions < V5.5.4), RUGGEDCOM RSG2100P (All versions < V4.3.7), RUGGEDCOM RSG2100P (32M) V4.X (All versions < V4.3.7), RUGGEDCOM RSG2100P (32M) V5.X (All versions < V5.5.4), RUGGEDCOM RSG2200 (All versions < V4.3.7), RUGGEDCOM RSG2288 V4.X (All versions < V4.3.7), RUGGEDCOM RSG2288 V5.X (All versions < V5.5.4), RUGGEDCOM RSG2300 V4.X (All versions < V4.3.7), RUGGEDCOM RSG2300 V5.X (All versions < V5.5.4), RUGGEDCOM RSG2300P V4.X (All versions < V4.3.7), RUGGEDCOM RSG2300P V5.X (All versions < V5.5.4), RUGGEDCOM RSG2488 V4.X (All versions < V4.3.7), RUGGEDCOM RSG2488 V5.X (All versions < V5.5.4), RUGGEDCOM RSG907R (All versions < V5.5.4), RUGGEDCOM RSG908C (All versions < V5.5.4), RUGGEDCOM RSG909R (All versions < V5.5.4), RUGGEDCOM RSG910C (All versions < V5.5.4), RUGGEDCOM RSG920P V4.X (All versions < V4.3.7), RUGGEDCOM RSG920P V5.X (All versions < V5.5.4), RUGGEDCOM RSL910 (All versions < V5.5.4), RUGGEDCOM RST2228 (All versions < V5.5.4), RUGGEDCOM RST2228P (All versions < V5.5.4), RUGGEDCOM RST916C (All versions < V5.5.4), RUGGEDCOM RST916P (All versions < V5.5.4). The DHCP client in affected devices fails to properly sanitize incoming DHCP packets. This could allow an unauthenticated remote attacker to cause memory to be overwritten, potentially allowing remote code execution.

Why

The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

What

A vulnerability has been identified in RUGGEDCOM i800 (All versions < V4.3.7), RUGGEDCOM i801 (All versions < V4.3.7), RUGGEDCOM i802 (All versions < V4.3.7), RUGGEDCOM i803 (All versions < V4.3.7), RUGGEDCOM M2100 (All versions < V4.3.7), RUGGEDCOM M2200 (All versions < V4.3.7), RUGGEDCOM M969 (All versions < V4.3.7), RUGGEDCOM RMC30 (All versions < V4.3.7), RUGGEDCOM RMC8388 V4.X (All versions < V4.3.7), RUGGEDCOM RMC8388 V5.X (All versions < V5.5.4), RUGGEDCOM RP110 (All versions < V4.3.7), RUGGEDCOM RS1600 (All versions < V4.3.7), RUGGEDCOM RS1600F (All versions < V4.3.7), RUGGEDCOM RS1600T (All versions < V4.3.7), RUGGEDCOM RS400 (All versions < V4.3.7), RUGGEDCOM RS401 (All versions < V4.3.7), RUGGEDCOM RS416 (All versions < V4.3.7), RUGGEDCOM RS416P (All versions < V4.3.7), RUGGEDCOM RS416Pv2 V4.X (All versions < V4.3.7), RUGGEDCOM RS416Pv2 V5.X (All versions < V5.5.4), RUGGEDCOM RS416v2 V4.X (All versions < V4.3.7), RUGGEDCOM RS416v2 V5.X (All versions < 5.5.4), RUGGEDCOM RS8000 (All versions < V4.3.7), RUGGEDCOM RS8000A (All versions < V4.3.7), RUGGEDCOM RS8000H (All versions < V4.3.7), RUGGEDCOM RS8000T (All versions < V4.3.7), RUGGEDCOM RS900 (32M) V4.X (All versions < V4.3.7), RUGGEDCOM RS900 (32M) V5.X (All versions < V5.5.4), RUGGEDCOM RS900G (All versions < V4.3.7), RUGGEDCOM RS900G (32M) V4.X (All versions < V4.3.7), RUGGEDCOM RS900G (32M) V5.X (All versions < V5.5.4), RUGGEDCOM RS900GP (All versions < V4.3.7), RUGGEDCOM RS900L (All versions < V4.3.7), RUGGEDCOM RS900W (All versions < V4.3.7), RUGGEDCOM RS910 (All versions < V4.3.7), RUGGEDCOM RS910L (All versions < V4.3.7), RUGGEDCOM RS910W (All versions < V4.3.7), RUGGEDCOM RS920L (All versions < V4.3.7), RUGGEDCOM RS920W (All versions < V4.3.7), RUGGEDCOM RS930L (All versions < V4.3.7), RUGGEDCOM RS930W (All versions < V4.3.7), RUGGEDCOM RS940G (All versions < V4.3.7), RUGGEDCOM RS969 (All versions < V4.3.7), RUGGEDCOM RSG2100 (All versions < V4.3.7), RUGGEDCOM RSG2100 (32M) V4.X (All versions < V4.3.7), RUGGEDCOM RSG2100 (32M) V5.X (All versions < V5.5.4), RUGGEDCOM RSG2100P (All versions < V4.3.7), RUGGEDCOM RSG2100P (32M) V4.X (All versions < V4.3.7), RUGGEDCOM RSG2100P (32M) V5.X (All versions < V5.5.4), RUGGEDCOM RSG2200 (All versions < V4.3.7), RUGGEDCOM RSG2288 V4.X (All versions < V4.3.7), RUGGEDCOM RSG2288 V5.X (All versions < V5.5.4), RUGGEDCOM RSG2300 V4.X (All versions < V4.3.7), RUGGEDCOM RSG2300 V5.X (All versions < V5.5.4), RUGGEDCOM RSG2300P V4.X (All versions < V4.3.7), RUGGEDCOM RSG2300P V5.X (All versions < V5.5.4), RUGGEDCOM RSG2488 V4.X (All versions < V4.3.7), RUGGEDCOM RSG2488 V5.X (All versions < V5.5.4), RUGGEDCOM RSG907R (All versions < V5.5.4), RUGGEDCOM RSG908C (All versions < V5.5.4), RUGGEDCOM RSG909R (All versions < V5.5.4), RUGGEDCOM RSG910C (All versions < V5.5.4), RUGGEDCOM RSG920P V4.X (All versions < V4.3.7), RUGGEDCOM RSG920P V5.X (All versions < V5.5.4), RUGGEDCOM RSL910 (All versions < V5.5.4), RUGGEDCOM RST2228 (All versions < V5.5.4), RUGGEDCOM RST2228P (All versions < V5.5.4), RUGGEDCOM RST916C (All versions < V5.5.4), RUGGEDCOM RST916P (All versions < V5.5.4). The DHCP client in affected devices fails to properly sanitize incoming DHCP packets. This could allow an unauthenticated remote attacker to cause memory to be overwritten, potentially allowing remote code execution.

Why

The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

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 → Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') → execute code or commands in the affected security context
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
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-120 ↗

CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow'). The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

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:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

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.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.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.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
NetworkUnauthenticatedRemote code executionCWE-120
A

Official authority intelligence

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

Cyber Security Agency of Singapore · English · CSA-SB-20210714Security Bulletin 14 Jul 2021

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 14 Jul 2021, published on 14 July 2021. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-518Multiples vulnérabilités dans les produits Siemens

d?id=CVE-2020-27827 Référence CVE CVE-2020-28400 https://www.cve.org/CVERecord?id=CVE-2020-28400 Référence CVE CVE-2021-20093 https://www.cve.org/CVERecord?id=CVE-2021-20093 Référence CVE CVE-2021-20094 https://www.cve.org/CVERecord?id=CVE-2021-20094 Référence CVE CVE-2021-25671 https://www.cve.org/CVERecord?id=CVE-2021-25671 Référence CVE CVE-2021-29998 https://www.cve.org/CVERecord?id=CVE-2021-29998 Référence CVE CVE-2021-31892 https://www.cve.org/CVERecord?id=CVE-2021-31892 Référence CVE CVE-2021-31893 https://www.cve.org/CVERecord?id=CVE-2021-31893 Référence CVE CVE-2021-31894 https://www.cve.org/CVERecord?id=CVE-2021-31894 Référence CVE CVE-2021-31895 https://www.cve.org/CVERecord?id=CVE-2021-31895 Référence CVE CVE-2021-33709 https://www.cve.org/CVERecord?id=CVE-2021-33709 Référence CVE CVE-2021-33710 https://www.cve.org/CVERecord?id=CVE-2021-33710 Référence CVE CVE-2021-33711 https://www.cve.org/CVERecord?id=CVE-2021-33711 Référence CVE CVE-2021-33713 https://www.cve.org/CVERecord?id=CVE-2021-33713 Référence CVE CVE-2021-33714 https://www.cve.org/CVERecord?id=CVE-2021-33714 Référence CVE CVE-2021-33715 https://www.cve.org/CVERecord?id=CVE-2021-33715 Référence CVE CVE-2021-33718 https://www.cve.org/CVERecord?id=CVE-2021-33718 Référence CVE CVE-2021-34291 https://www.cve.org/CVERecord?id=

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-010132複数のシーメンス製品における境界外書き込みに関する脆弱性

複数のシーメンス製品には、境界外書き込みに関する脆弱性が存在します。

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
Update to V4.3.7 or later version
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 13 Jul 2021 · Last source change 14 Oct 2025, 09:14 UTC · CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVE recordCVE.org · 5.1
CVSS sourceCNA
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-2021-18770
Product sourceVendor CSAF · Siemens ProductCERT
Remediation sourceVendor CSAF · Siemens ProductCERT
CWE sourceCNA
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
    All versions < V4.3.7 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    All versions < V4.3.7 · Fixed: Update to V4.3.7 or later version
    Siemens ProductCERT ↗
  2. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    Siemens ProductCERT ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2021-18770↗Siemens ProductCERT security advisory · Siemens SSA-373591↗CVE authority or vendor 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-2021-31895 · cve.blacktree.nl