9.6
Critical
Exploited
· ransomware
CVE-2024-55591 Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability
Active exploitation observed
· CISA KEV catalogue
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Ransomware campaigns
Known to be used
Weakness
CWE-288
Description
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| FortiOS 7.0 | 7.0.0 → 7.0.16 | No fix stated |
| FortiProxy 7.2 | 7.2.0 → 7.2.12 | No fix stated |
| FortiProxy 7.0 | 7.0.0 → 7.0.19 | No fix stated |
References
- fortiguard.fortinet.com fortiguard.fortinet.com
Timeline
- Published
- Added to the KEV catalogue
- Last modified
Other CVEs of FortiOS
The 180 CVEs of FortiOS →
CVE-2026-106174
A improper locking vulnerability in Fortinet FortiOS 8.0.0, FortiOS 7.6.4 through 7.6.6 may allow an unauthenticated…
6.7
Medium
CVE-2026-106175
A Double Free vulnerability [CWE-415] vulnerability in Fortinet FortiOS 7.6.0 through 7.6.8, FortiOS 7.4 all versions,…
2.1
Low
CVE-2026-84392
A NULL Pointer Dereference vulnerability [CWE-476] vulnerability in Fortinet FortiOS 7.4 all versions, FortiOS 7.2 all…
2.5
Low
CVE-2026-84393
A improper validation of certificate with host mismatch vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6,…
7.3
High