Known Exploited Vulnerability: CVE-2024-55591

Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability

Catalog version: 2026.07.16 Date added: 2025-01-14 Due date: 2025-01-21 CISA catalog

Vendor: Fortinet

Product: FortiOS and FortiProxy

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

Known ransomware campaign use: Known

Notes: https://fortiguard.fortinet.com/psirt/FG-IR-24-535 https://nvd.nist.gov/vuln/detail/CVE-2024-55591

CWEs

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