FortiSIEM Unauthenticated RCE via phMonitor OS Command Injection (CVE-2025-64155)
Fortinet disclosed and patched a critical FortiSIEM OS command injection vulnerability, CVE-2025-64155 (CVSS 9.4), that enables unauthenticated remote code execution via crafted TCP/CLI requests to the phMonitor service (default port 7900). Impact is reported on FortiSIEM Super and Worker nodes (Collector nodes reportedly not affected), with recommended upgrades to 7.4.1, 7.3.5, or 7.2.7; a key mitigation is to restrict network access to port 7900.
Technical analysis described an exploit chain in which attacker-controlled inputs in phMonitor requests can be leveraged for argument injection leading to arbitrary file write and code execution (initially as an admin-level context), followed by a file overwrite privilege escalation to root. Public exploit material is reported to be available, and the issue has drawn threat-actor interest (including references in leaked Black Basta chats), increasing the likelihood of opportunistic exploitation against exposed FortiSIEM deployments.
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