Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability (CVE-2024-55591)
Severity: critical · Patch status: unknown · Since 2025-01-14 · CVE-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 added CVE-2024-55591 to its Known Exploited Vulnerabilities catalog on Jan 14, 2025, which means attackers are exploiting it in the wild. CISA reports known use in ransomware campaigns.
What to do
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Jan 21, 2025 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
