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Full vulnerability report · 2024
CVE-2024-21762High confidence

Fortinet FortiOS Out-of-Bound Write Vulnerability

Fortinet · FortiOS

Official source article: Siemens SSA-770770 ↗. Check the applicable product and release in the original source.

9.6CriticalCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

CISA confirms exploitation in the wild and lists 2024-02-16 as the remediation due date. 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 severityCriticalOperational priority:Critical, unchanged from published severity.unchanged

Evidence used

  • CISA confirms exploitation in the wild.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 83.43% 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.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Fortinet FortiOS 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.

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-770770 · CSAF 2.0 · revision 9 · finalSiemens ProductCERTSSA-770770: Multiple Vulnerabilities in Fortigate NGFW Before V7.4.7 on RUGGEDCOM APE1808 Devices
1 known affected

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

  • RUGGEDCOM APE1808
Summary
A out-of-bounds write in Fortinet FortiOS versions 7.4.0 through 7.4.2, 7.2.0 through 7.2.6, 7.0.0 through 7.0.13, 6.4.0 through 6.4.14, 6.2.0 through 6.2.15, 6.0.0 through 6.0.17, FortiProxy versions 7.4.0 through 7.4.2, 7.2.0 through 7.2.8, 7.0.0 through 7.0.14, 2.0.0 through 2.0.13, 1.2.0 through 1.2.13, 1.1.0 through 1.1.6, 1.0.0 through 1.0.7 allows attacker to execute unauthorized code or commands via specifically crafted requests
Remediation
Update Fortigate NGFW to V7.4.7. Contact customer support to receive patch and update information
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-2024-19376

CISA KEV mirrored by ENISA

A out-of-bounds write in Fortinet FortiOS versions 7.4.0 through 7.4.2, 7.2.0 through 7.2.6, 7.0.0 through 7.0.13, 6.4.0 through 6.4.14, 6.2.0 through 6.2.15, 6.0.0 through 6.0.17, FortiProxy versions 7.4.0 through 7.4.2, 7.2.0 through 7.2.8, 7.0.0 through 7.0.14, 2.0.0 through 2.0.13, 1.2.0 through 1.2.13, 1.1.0 through 1.1.6, 1.0.0 through 1.0.7 allows attacker to execute unauthorized code or commands via specifically crafted requests

EUVD state
Present in the current official mapping
Known exploitation
Recorded by ENISA since 9 Feb 2024. Evidence sources: cisa_kev.
ENISA score
9.6 · CVSS 3.1
Advisory evidence
6 linked advisory records
Explicit mitigation evidence

Only statements that explicitly mention a fix, patch, update, workaround or mitigation are shown here.

  • csaf_ncscnl · NCSC-2025-0018Kwetsbaarheden verholpen in Fortinet FortiSwitch, FortiManager, FortiAnalyzer, FortiOS en FortiProxy
Recommended actionPatch only the product branches with a verified fix

CISA confirms exploitation in the wild and lists 2024-02-16 as the remediation due date. 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

Fortinet FortiOS contains an out-of-bound write vulnerability that allows a remote unauthenticated attacker to execute code or commands via specially crafted HTTP requests.

What

Fortinet FortiOS contains an out-of-bound write vulnerability that allows a remote unauthenticated attacker to execute code or commands via specially crafted HTTP requests.

Why

A bounds error lets data be written beyond the intended memory region, potentially corrupting control data.

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

Fortinet FortiOS contains an out-of-bound write vulnerability that allows a remote unauthenticated attacker to execute code or commands via specially crafted HTTP requests.

Why

A bounds error lets data be written beyond the intended memory region, potentially corrupting control data.

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.
Confirmed in the wild

CISA added this CVE to its Known Exploited Vulnerabilities catalogue on 2024-02-09. Known ransomware campaign use is recorded.

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 → Out-of-bounds Write → execute code or commands in the affected security context
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-787 ↗

CWE-787: Out-of-bounds Write. The product writes data past the end, or before the beginning, of the intended 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:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:W/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.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.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-787CISA KEV
A

Official authority intelligence

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

ENISA EUVD · EUVD-2024-19376Known-exploited evidence recorded

A out-of-bounds write in Fortinet FortiOS versions 7.4.0 through 7.4.2, 7.2.0 through 7.2.6, 7.0.0 through 7.0.13, 6.4.0 through 6.4.14, 6.2.0 through 6.2.15, 6.0.0 through 6.0.17, FortiProxy versions 7.4.0 through 7.4.2, 7.2.0 through 7.2.8, 7.0.0 through 7.0.14, 2.0.0 through 2.0.13, 1.2.0 through 1.2.13, 1.1.0 through 1.1.6, 1.0.0 through 1.0.7 allows attacker to execute unauthorized code or commands via specifically crafted requests

Official EUVD record ↗
BSI · German · WID-SEC-2024-0330Fortinet FortiOS: Mehrere Schwachstellen ermöglichen Codeausführung

Ein entfernter anonymer Angreifer kann mehrere Schwachstellen in Fortinet FortiOS ausnutzen, um beliebigen Code auszuführen.

Official advisory ↗
Canadian Centre for Cyber Security · English · AL25-005Compromise and persistent access of Fortinet FortiOS products (CVE-2022-42475, CVE-2023-27997, CVE-2024-21762)

An Alert is used to raise awareness of a recently identified cyber threat that may impact cyber information assets, and to provide additional detection and mitigation advice to recipients. The Canadian Centre for Cyber Security ("Cyber Centre") is also available to provide additional assistance regarding the content of this Alert to recipients as requested.

Official advisory ↗
Canadian Centre for Cyber Security · English · AL24-003Vulnerabilities impacting Fortinet FortiOS – Update 1

An Alert is used to raise awareness of a recently identified cyber threat that may impact cyber information assets, and to provide additional detection and mitigation advice to recipients. The Canadian Centre for Cyber Security ("Cyber Centre") is also available to provide additional assistance regarding the content of this Alert to recipients as requested.

Official advisory ↗
Canadian Centre for Cyber Security · English · AV24-074Fortinet security advisory (AV24-074)

On February 8, 2024, Fortinet published security advisories to address vulnerabilities in multiple products. Included were critical updates for the following products: Fortinet has indicated that CVE-2024-21762 may have been exploited.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20240214Security Bulletin 14 Feb 2024

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 14 Feb 2024, published on 14 February 2024. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0203Multiples vulnérabilités dans les produits Siemens

d?id=CVE-2023-40718 Référence CVE CVE-2023-41675 https://www.cve.org/CVERecord?id=CVE-2023-41675 Référence CVE CVE-2023-41841 https://www.cve.org/CVERecord?id=CVE-2023-41841 Référence CVE CVE-2023-44250 https://www.cve.org/CVERecord?id=CVE-2023-44250 Référence CVE CVE-2023-44487 https://www.cve.org/CVERecord?id=CVE-2023-44487 Référence CVE CVE-2023-45793 https://www.cve.org/CVERecord?id=CVE-2023-45793 Référence CVE CVE-2023-47537 https://www.cve.org/CVERecord?id=CVE-2023-47537 Référence CVE CVE-2023-49125 https://www.cve.org/CVERecord?id=CVE-2023-49125 Référence CVE CVE-2024-21483 https://www.cve.org/CVERecord?id=CVE-2024-21483 Référence CVE CVE-2024-21762 https://www.cve.org/CVERecord?id=CVE-2024-21762 Référence CVE CVE-2024-22039 https://www.cve.org/CVERecord?id=CVE-2024-22039 Référence CVE CVE-2024-22040 https://www.cve.org/CVERecord?id=CVE-2024-22040 Référence CVE CVE-2024-22041 https://www.cve.org/CVERecord?id=CVE-2024-22041 Référence CVE CVE-2024-22044 https://www.cve.org/CVERecord?id=CVE-2024-22044 Référence CVE CVE-2024-22045 https://www.cve.org/CVERecord?id=CVE-2024-22045 Référence CVE CVE-2024-23113 https://www.cve.org/CVERecord?id=CVE-2024-23113 Gestion détaillée du document le 12 mars 2024 Version initiale Alertes Avis Bulletins d’actualités Mentions légales Conditions générales À

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0108Multiples vulnérabilités dans les produits Fortinet

De multiples vulnérabilités ont été découvertes dans les produits Fortinet . Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un déni de service à distance et un contournement de la politique de sécurité.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2024-002614フォーティネットの FortiProxy および FortiOS における境界外書き込みに関する脆弱性

フォーティネットの FortiProxy および FortiOS には、境界外書き込みに関する脆弱性が存在します。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6448Fortinet 제품 보안 업데이트 권고

FortiOS 및 FortiProxy의 SSL-VPN에서 발생하는 범위를 벗어난 쓰기 취약점(CVE-2024-21762) [1][4][7]

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6105Fortinet 제품 보안 업데이트 권고

FortiOS 및 FortiProxy의 sslvpnd에서 발생하는 범위를 벗어난 쓰기 취약점(CVE-2024-21762) [2]

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6100美 CISA 발표 주요 Exploit 정보공유(Update. 2024-02-09)

Fortinet FortiOS contains an out-of-bound write vulnerability that allows a remote unauthenticated attacker to execute code or commands via specially crafted HTTP requests.

Official advisory ↗
NCSC-NL · Dutch · NCSC-2025-0018Kwetsbaarheden verholpen in Fortinet FortiSwitch, FortiManager, FortiAnalyzer, FortiOS en FortiProxy

De kwetsbaarheden omvatten onder andere hard-coded cryptografische sleutels, onjuiste verwerking van OS-commando's, en out-of-bounds schrijf- en leesfouten. Aanvallers kunnen deze kwetsbaarheden misbruiken om ongeautoriseerde toegang te verkrijgen, willekeurige code uit te voeren en Denial-of-Service-aanvallen te veroorzaken.

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
RUGGEDCOM APE1808
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 9 Feb 2024 · Last source change 4 Aug 2026, 03:55 UTC · CWE-787 · Out-of-bounds Write

CVE recordCVE.org · 5.2
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-2024-19376
Product sourceVendor CSAF · Siemens ProductCERT
Remediation sourceVendor CSAF · Siemens ProductCERT
CWE sourceCNA
NVD statusNVD enriched

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

Material change intelligence

What changed after publication

View recent updates ↗
  1. Vendor guidanceAuthoritative vendor guidance changed: added remediation: fortiguard.com/FG-IR-24-015.
    Before
    vendor advisory: fortiguard.com/FG-IR-24-015
    After
    remediation: fortiguard.com/FG-IR-24-015 · vendor advisory: fortiguard.com/FG-IR-24-015
    fortiguard.com ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    7.4.0 ≤ 7.4.2; 7.2.0 ≤ 7.2.8; 7.0.0 ≤ 7.0.14; 2.0.0 ≤ 2.0.13; 1.2.0 ≤ 1.2.13; 1.1.0 ≤ 1.1.6; 1.0.0 ≤ 1.0.7; 7.2.0 ≤ 7.2.6 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    FortiProxy: 7.4.0 ≤ 7.4.2, 7.2.0 ≤ 7.2.8, 7.0.0 ≤ 7.0.14, 2.0.0 ≤ 2.0.13, 1.2.0 ≤ 1.2.13, 1.1.0 ≤ 1.1.6, 1.0.0 ≤ 1.0.7; FortiOS: 7.4.0 ≤ 7.4.2, 7.2.0 ≤ 7.2.6, 7.0.0 ≤ 7.0.13, 6.4.0 ≤ 6.4.14, 6.2.0 ≤ 6.2.15, 6.0.0 ≤ 6.0.17 · Fixed: Please upgrade to FortiProxy version 7.4.3 or above; Please upgrade to FortiProxy version 7.2.9 or above; Please upgrade to FortiProxy version 7.0.15 or above; Please upgrade to FortiProxy version 2.0.14 or above; Please upgrade to FortiOS version 7.6.0 or above; Please upgrade to FortiOS version 7.4.3 or above; Please upgrade to FortiOS version 7.2.7 or above; Please upgrade to FortiOS version 7.0.14 or above; Please upgrade to FortiOS version 6.4.15 or above; Please upgrade to FortiOS version 6.2.16 or above
    CNA ↗
  3. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    fortiguard.com ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Added to CISA KEV
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2024-19376↗Vendor CSAF · Siemens ProductCERT · Siemens SSA-770770↗CISA KEV record↗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-2024-21762 · cve.blacktree.nl