CVE-2021-36194: Fortinet FortiWeb

High severity, CVSS 8.8. EPSS: 1.4% chance of exploitation in the next 30 days.

Multiple stack-based buffer overflows in the API controllers of FortiWeb 6.4.1, 6.4.0, and 6.3.0 through 6.3.15 may allow an authenticated attacker to achieve arbitrary code execution via specially crafted requests.

Affected products

• Fortinet FortiWeb: from 6.3.0, up to and including 6.3.15; version 6.4.0 only; version 6.4.1 only

Published 2021-12-09. Last modified 2026-06-17.