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Critical FortiSIEM Vulnerability CVE-2025-64155 Under Active Exploitation

Critical FortiSIEM Vulnerability CVE-2025-64155 Under Active Exploitation

First seen 17 Jan 2026, 05:01 UTC • •

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ThreatCluster AI
ThreatCluster •March 12, 2026 at 13:27 UTC

A critical vulnerability (CVE-2025-64155) in Fortinet's FortiSIEM platform allows unauthenticated remote code execution via crafted TCP requests. This OS command injection flaw affects the phMonitor service, which is crucial for enterprise security monitoring, and is currently being exploited in the wild. Organizations are urged to apply patches immediately to mitigate risks.

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