CVE-2024-55591
Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 21 January 2025). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 94.35% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 14 January 2025 · due 21 January 2025 · used in ransomware campaigns
- Weakness
- CWE-288
- Affected
- fortinet/fortiproxy · fortinet/fortios
- Source
- psirt@fortinet.com
EPSS moved from 94.1% on 24 September 2026 to 94.3% on 30 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
CISA notes
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. https://fortiguard.fortinet.com/psirt/FG-IR-24-535 ; https://nvd.nist.gov/vuln/detail/CVE-2024-55591
References
- https://fortiguard.fortinet.com/psirt/FG-IR-24-535Mitigation, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-55591US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.