CVE-2021-36190: Fortinet FortiWeb

Medium severity, CVSS 6.3. EPSS: 0.8% chance of exploitation in the next 30 days.

A unintended proxy or intermediary ('confused deputy') in Fortinet FortiWeb version 6.4.1 and below, 6.3.15 and below allows an unauthenticated attacker to access protected hosts via crafted HTTP requests.

Affected products

• Fortinet FortiWeb: from 6.0.0, up to and including 6.0.7; from 6.2.0, up to and including 6.2.6; from 6.3.0, up to and including 6.3.15; version 6.1.0 only; version 6.1.1 only; version 6.1.2 only; …

Published 2021-12-08. Last modified 2026-06-17.