CVEs / CVE-2024-55591
CVE-2024-55591: Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability
- Known exploited in the CISA KEV catalog since 14 Jan 2025
- critical 9.8 CVSS 3.1 (NVD)
- EPSS 94.3% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
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.
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 and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Fortinet FortiOS | from 7.0.0, up to and including 7.0.16 | — |
| Fortinet FortiProxy | from 7.2.0, up to and including 7.2.12 | — |
| Fortinet FortiProxy | from 7.0.0, up to and including 7.0.19 | — |
Exploitation
| In CISA KEV since | 14 Jan 2025 |
|---|---|
| Due date for US federal agencies | 21 Jan 2025 |
| Used in ransomware campaigns | Known |
| Required action | Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. |
Severity
| CVSS 3.1 | 9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HScored by NVD |
|---|---|
| Weakness | CWE-288 |
References
- CVE-2024-55591 on NVD
- CVE-2024-55591 in the CISA KEV catalog
- https://fortiguard.fortinet.com/psirt/FG-IR-24-535 (cited by CISA)
- https://fortiguard.fortinet.com/psirt/FG-IR-24-535 Mitigation, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-55591 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.