Risk Letters

Exploited vulnerability

CVE-2024-55591

TLP:CLEAR

Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability

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.

Facts

  • Vendor: Fortinet
  • Product: FortiOS and FortiProxy
  • CVSS: 9.8
  • EPSS (probability of exploitation within 30 days): 94.4 %
  • On CISA's Known Exploited Vulnerabilities list since: 14 January 2025
  • First known exploitation: 14 January 2025
  • Used in ransomware campaigns (per CISA): Yes
  • CISA's deadline for US federal agencies: 21 January 2025
  • Weakness: CWE-288
  • First seen by Risk Letters: 14 January 2025

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD