CVE-2024-55591

CRITICAL9.8

CISA KEV

Published 2025-01-14 · Updated 2026-08-05 · Source psirt@fortinet.com

Summary

CVE-2024-55591 is a critical-severity (CVSS 9.8) vulnerability in Fortinet FortiOS and FortiProxy. CISA added it to the Known Exploited Vulnerabilities catalog on January 14, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by January 21, 2025. CISA also lists it as known to be used in ransomware campaigns, so it should be prioritised accordingly. Fortinet has 32 vulnerabilities in the KEV catalog, 14 of them linked to ransomware.

All 32 known-exploited Fortinet vulnerabilities →

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 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-288

CISA Known-Exploited Vulnerability

Product: Fortinet — FortiOS and FortiProxy

Name: Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability

Date added: 2025-01-14 · Due: 2025-01-21

USED IN RANSOMWARE

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

References

View on NVD

More exploited Fortinet vulnerabilities

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CVE-2025-61624
Multiple Products — Fortinet Multiple Products Path Traversal Vulnerability
added 2026-10-16
CVE-2026-104286
FortiMail — Fortinet FortiMail Path Traversal Vulnerability
added 2026-10-01
CVE-2025-25249
Multiple Products — Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
added 2026-09-09
CVE-2025-68686
FortiOS — Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor Vulnerability
added 2026-07-27
CVE-2026-25089
FortiSandbox — Fortinet FortiSandbox OS Command Injection Vulnerability
added 2026-07-16
CVE-2026-39808
FortiSandbox — Fortinet FortiSandbox OS Command Injection Vulnerability
added 2026-07-16

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