OS command injection in FortiSIEM - CVE-2025-64155
Published: January 13, 2026 / Updated: January 16, 2026
Vulnerability identifier: #VU121224
CSH Severity: Critical
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-64155
CWE-ID: CWE-78
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.
The vulnerability exists due to improper input validation in phMonitor. A remote unauthenticated attacker can send specially crafted packets to port 7900/TCP and execute arbitrary OS commands on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
FortiSIEM
How to mitigate CVE-2025-64155
Install updates from vendor's website.
FortiSIEM - addressed in versions 7.1.9, 7.2.7, 7.3.5, 7.4.1