CVE-2025-53844: Fortinet FortiOS

High severity, CVSS 8.8. EPSS: 0.6% chance of exploitation in the next 30 days.

A out-of-bounds write vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11 allows attacker to execute unauthorized code or commands via specially crafted packets.

Affected products

• Fortinet FortiOS: from 7.2.0, before 7.2.12 (fixed in 7.2.12); from 7.4.0, before 7.4.9 (fixed in 7.4.9); from 7.6.0, before 7.6.4 (fixed in 7.6.4)

Published 2026-05-12. Last modified 2026-10-07.