Critical FortiSIEM Vulnerability (CVE-2025-25256) Enables Remote Command Execution

A critical security vulnerability in the Fortinet FortiSIEM platform, identified as CVE-2025-25256, enables unauthenticated attackers to execute arbitrary commands remotely. Classified as CWE-78 (OS Command Injection), this flaw has been actively exploited, with practical exploit code already circulating among threat actors.

The vulnerability arises from improper handling of special elements in operating system commands within FortiSIEM’s architecture, allowing remote command injection through crafted Command Line Interface (CLI) requests. This poses a severe security risk, as attackers can bypass authentication and execute unauthorized commands on vulnerable systems.

The exploit targets the phMonitor port 7900, which serves as the primary attack vector. Security researchers have confirmed that exploit code is in active use, making detection difficult due to the lack of distinctive Indicators of Compromise (IoCs).

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