CVE-2024-55591
Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA notes
https://fortiguard.fortinet.com/psirt/FG-IR-24-535 ; https://nvd.nist.gov/vuln/detail/CVE-2024-55591
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.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:CExploitation Context
as of October 17, 2026- CISA added CVE-2024-55591 to the KEV catalog on the day its CVE record was published. The median for entries added in 2025 is 26 days.
- It is one of 32 Fortinet entries in the CISA KEV catalog, and one of 8 added in 2025.
- Its current EPSS score (94.1%) is higher than that of 77% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Fortinet | Fortinet FortiOS | 7.0.0 to 7.0.16 |
| Fortinet | Fortinet FortiProxy | 7.2.0 to 7.2.12 7.0.0 to 7.0.19 |
References
1 LinksRecord Details
More from Fortinet
Fortinet FortiOS and FortiProxy Improper Authorization
Fortinet FortiOS and FortiProxy Out-of-bounds Write
Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability
Fortinet FortiOS SSL VPN Path Traversal Vulnerability
Related
Tool categories
CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.