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CVE-2024-55591: Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability

criticalknown exploitedpublic exploitCVE-2024-55591
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Fortinet FortiOS and FortiProxy contain an authentication bypass vulnerability that may allow an unauthenticated, remote attacker to gain super-admin privileges via crafted requests to Node.js websocket module.

CSIRTS triage

vendor: Fortinetproduct: FortiOS and FortiProxyAuthentication bypass
What
These products contain an authentication bypass vulnerability that may allow an unauthenticated, remote attacker to gain super-admin privileges.
Who is affected
All deployments of FortiOS and FortiProxy are affected.
Urgency
Immediate remediation is necessary as the vulnerability is actively exploited and rated critical.
Action
Apply the latest security patches from Fortinet.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-01-14
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2024-55591

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2024-55591coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Fortinet FortiOS and

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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