Exploited vulnerability · CISA KEV
Yes. CVE-2024-55591, Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 14 Jan 2025, the day it was published. It is known to be used in ransomware campaigns. It affects Fortinet FortiOS and FortiProxy, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
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.
| Vendor | Fortinet (32 exploited CVEs in KEV) |
| Product | FortiOS and FortiProxy |
| Vulnerability | Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability |
| Weakness | CWE-288 |
| Published | 14 Jan 2025 |
| Added to KEV | 14 Jan 2025 |
| Reported by (CNA) | fortinet |
Yes. CISA added CVE-2024-55591 to the Known Exploited Vulnerabilities catalog on 14 Jan 2025, which means there is reliable evidence of exploitation in the wild.
Yes, CISA lists it as known to be used in ransomware campaigns.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check Fortinet's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected FortiOS and FortiProxy and watch it for signs of compromise.
Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in January 2025 · Fortinet scorecard · act-now radar.
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