CVE-2021-36167: Fortinet FortiClient

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

An improper authorization vulnerabiltiy [CWE-285] in FortiClient Windows versions 7.0.0 and 6.4.6 and below and 6.2.8 and below may allow an unauthenticated attacker to bypass the webfilter control via modifying the session-id paramater.

Affected products

• Fortinet FortiClient: from 6.4.0, up to and including 6.4.6; version 6.2.7 only; version 7.0.0 only

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