CVE-2025-64447: Fortinet FortiWeb

High severity, CVSS 8.1. EPSS: 8.4% chance of exploitation in the next 30 days.

A reliance on cookies without validation and integrity checking vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.1, FortiWeb 7.6.0 through 7.6.5, FortiWeb 7.4.0 through 7.4.10, FortiWeb 7.2.0 through 7.2.11, FortiWeb 7.0.0 through 7.0.11 may allow an unauthenticated attacker to execute arbitrary operations on the system via crafted HTTP or HTTPS request via forged cookies, requiring prior knowledge of the FortiWeb serial number.

Affected products

• Fortinet FortiWeb: from 7.0.0, up to and including 7.0.11; from 7.2.0, up to and including 7.2.11; from 7.4.0, up to and including 7.4.10; from 7.6.0, up to and including 7.6.5; from 8.0.0, up to and including 8.0.1

Published 2025-12-09. Last modified 2026-09-25.