CVE-2025-64155: Fortinet Fortisiem

Critical severity, CVSS 9.8. EPSS: 42.8% chance of exploitation in the next 30 days.

An improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSIEM 7.4.0, FortiSIEM 7.3.0 through 7.3.4, FortiSIEM 7.1.0 through 7.1.8, FortiSIEM 7.0.0 through 7.0.4, FortiSIEM 6.7.0 through 6.7.10 may allow an attacker to execute unauthorized code or commands via crafted TCP requests.

Affected products

• Fortinet Fortisiem: from 6.7.0, before 7.1.9 (fixed in 7.1.9); from 7.2.0, before 7.2.7 (fixed in 7.2.7); from 7.3.0, before 7.3.5 (fixed in 7.3.5); version 7.4.0 only

Published 2026-01-13. Last modified 2026-06-17.