CVE-2021-36186: Fortinet FortiWeb

Critical severity, CVSS 9.8. EPSS: 1.6% chance of exploitation in the next 30 days.

A stack-based buffer overflow in Fortinet FortiWeb version 6.4.0, version 6.3.15 and below, 6.2.5 and below allows attacker to execute unauthorized code or commands via crafted HTTP requests

Affected products

• Fortinet FortiWeb: from 6.2.0, up to and including 6.2.5; from 6.3.0, up to and including 6.3.15; version 6.4.0 only

Published 2021-11-02. Last modified 2026-06-17.