January 14, 2025 · Applied Cybernetics Group
CVE-2024-55591 — Fortinet FortiOS and FortiProxy
known ransomware use
Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability
- Added to KEV
2025-01-14- Federal due date
2025-01-21- Vendor
- Fortinet
- Product
- FortiOS and FortiProxy
- EPSS
- 99.9th percentile (score 0.941, as of
2026-06-08) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2024-55591
CISA short description
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.
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.