Advisory Details

December 16th, 2025

Fortinet FortiWeb ApacheCookie_parse Improper Verification of Cryptographic Signature Authentication Bypass Vulnerability

CVE ID	CVE-2025-64447
CVSS SCORE	8.1, AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Fortinet
AFFECTED PRODUCTS	FortiWeb
VULNERABILITY DETAILS	This vulnerability allows remote attackers to bypass authentication on affected installations of Fortinet FortiWeb. Authentication is not required to exploit this vulnerability. The specific flaw exists within the ApacheCookie_parse method. The issue results from the lack of proper verification of a cryptographic signature. An attacker can leverage this vulnerability to bypass authentication on the system.
ADDITIONAL DETAILS	Fortinet has issued an update to correct this vulnerability. More details can be found at: https://fortiguard.fortinet.com/psirt/FG-IR-25-945
DISCLOSURE TIMELINE	2025-10-10 - Vulnerability reported to vendor 2025-12-16 - Coordinated public release of advisory 2025-12-16 - Advisory Updated
CREDIT	Jason McFadyen of Trend Research

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