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Vulnerabilities

Vulnerability · CVE-2024-55591

Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability

Published Jan 14, 2025 · catalog updated Aug 4, 2026 · Fortinet FortiOS and FortiProxy

Patch now

CVE-2024-55591 is in the CISA known-exploited catalog, due Jan 21, 2025. Confirm Fortinet FortiOS and FortiProxy against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
94.15%
Remediation
Remediation guidance
Affected products
cpe fortinet/fortios · cpe fortinet/fortiproxy · vendor Fortinet FortiOS and FortiProxy

An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through 7.0.16 and FortiProxy version 7.0.0 through 7.0.19 and 7.2.0 through 7.2.12 allows a remote attacker to gain super-admin privileges via crafted requests to Node.js websocket module.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe fortinet/fortiosversion unspecified
  • cpe fortinet/fortiproxyversion unspecified
  • vendor Fortinet FortiOS and FortiProxyversion unspecified

How to fix CVE-2024-55591

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2024-55591 is in the CISA known-exploited catalog, due Jan 21, 2025. Confirm Fortinet FortiOS and FortiProxy against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What should an analyst verify?

CWE-288. EPSS 94.15%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Fortinet security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 14, 2025 · Catalog

    Detected

    An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through 7.0.16 and FortiProxy version 7.0.0 through 7.0.19 and 7.2.0 through 7.2.12 allows a remote attacker to gain super-admin privileges via crafted requests to Node.js websocket module.

  2. Jan 14, 2025 · CISA KEV

    Known exploited

    Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

  3. Jan 21, 2025 · CISA KEV

    Remediation due

    Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

  4. Aug 4, 2026 · Catalog

    Updated

    An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through 7.0.16 and FortiProxy version 7.0.0 through 7.0.19 and 7.2.0 through 7.2.12 allows a remote attacker to gain super-admin privileges via crafted requests to Node.js websocket module.

Sources

  • CERT-FRGovernment advisoryCVE-2024-55591

    \[Mise à jour du 28 janvier 2025\] Une preuve de concept permettant l'exploitation de cette vulnérabilité est disponible publiquement. Le 14 janvier 2025, Fortinet a publié un avis de sécurité concernant la vulnérabilité critique CVE-2024-55591 affectant FortiOS et FortiProxy. El

    cert.ssi.gouv.fr
  • CISA KEVConfirmed exploitationCVE-2024-55591

    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.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2024-55591

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2024-55591

    30-day exploitation probability 94.1%

    first.org
  • NIST NVDVulnerability recordCVE-2024-55591

    An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through 7.0.16 and FortiProxy version 7.0.0 through 7.0.19 and 7.2.0 through 7.2.12 allows a remote attacker to gain super-admin privileges via crafted requests to

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2024-55591

    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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.