CVE-2021-36169: Fortinet FortiOS

Medium severity, CVSS 6.0. EPSS: 0.3% chance of exploitation in the next 30 days.

A Hidden Functionality in Fortinet FortiOS 7.x before 7.0.1, FortiOS 6.4.x before 6.4.7 allows attacker to Execute unauthorized code or commands via specific hex read/write operations.

Affected products

• Fortinet FortiOS: from 5.6.0, up to and including 5.6.14; from 6.0.0, up to and including 6.0.14; from 6.2.0, before 6.2.10 (fixed in 6.2.10); from 6.4.0, before 6.4.7 (fixed in 6.4.7); version 7.0.0 only

Published 2021-12-13. Last modified 2026-06-17.