CVE-2025-53847: Fortinet FortiOS

High severity, CVSS 8.8. EPSS: 0.3% chance of exploitation in the next 30 days.

A missing authentication for critical function 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, FortiOS 7.0.0 through 7.0.17, FortiOS 6.4 all versions, FortiOS 6.2.9 through 6.2.17 allows attacker to execute unauthorized code or commands via specially crafted packets.

Affected products

• Fortinet FortiOS: from 6.2.9, before 7.0.18 (fixed in 7.0.18); 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 2026-04-14. Last modified 2026-10-07.