CVE-2023-36639: Fortinet FortiOS

High severity, CVSS 8.8. EPSS: 1.1% chance of exploitation in the next 30 days.

A use of externally-controlled format string in Fortinet FortiProxy versions 7.2.0 through 7.2.4, 7.0.0 through 7.0.10, FortiOS versions 7.4.0, 7.2.0 through 7.2.4, 7.0.0 through 7.0.11, 6.4.0 through 6.4.12, 6.2.0 through 6.2.15, 6.0.0 through 6.0.17, FortiPAM versions 1.0.0 through 1.0.3 allows attacker to execute unauthorized code or commands via specially crafted API requests.

Affected products

• Fortinet FortiOS: from 6.0.0, up to and including 6.0.17; from 6.2.0, up to and including 6.2.15; from 6.4.0, up to and including 6.4.12; from 7.0.0, up to and including 7.0.11; from 7.2.0, up to and including 7.2.4; version 7.4.0 only
• Fortinet Fortipam: from 1.0.0, up to and including 1.0.3; version 1.1.0 only
• Fortinet FortiProxy: from 7.0.0, up to and including 7.0.10; from 7.2.0, up to and including 7.2.4

Published 2023-12-13. Last modified 2026-06-17.