CVE-2021-43064: Fortinet FortiWeb

Medium severity, CVSS 6.1. EPSS: 0.6% chance of exploitation in the next 30 days.

A url redirection to untrusted site ('open redirect') in Fortinet FortiWeb version 6.4.1 and 6.4.0, version 6.3.15 and below, version 6.2.6 and below allows attacker to use the device as a proxy and reach external or protected hosts via redirection handlers.

Affected products

• Fortinet FortiWeb: from 6.2.0, up to and including 6.2.6; from 6.3.0, up to and including 6.3.15; version 6.4.0 only; version 6.4.1 only

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