ET EXPLOIT Fortinet FortiSIEM phMonitor Unauthenticated Argument Injection (CVE-2025-64155)

alert tcp any any -> $HOME_NET any (
    msg:"ET EXPLOIT Fortinet FortiSIEM phMonitor Unauthenticated Argument Injection (CVE-2025-64155)";
    flow:established,to_server;
    content:"|9c 00 00 00|"; startswith;
    content:"|6f 42 1e 40 00 00 00 00|"; distance:4; within:8;
    content:"|3c|client_type|3e|javaTransportClient"; fast_pattern;
    content:"|3c|cluster_url|3e|";
    pcre:"/^[^\x3c]*?\x20\x2d{1,2}\w+/R";
    reference:url,horizon3.ai/attack-research/disclosures/cve-2025-64155-three-years-of-remotely-rooting-the-fortinet-fortisiem/;
    reference:cve,2025-64155;
    classtype:attempted-user;
    sid:2066746; rev:1;
    metadata:affected_product FortiSIEM, attack_target Server, tls_state TLSDecrypt, created_at 2026_01_14, cve CVE_2025_64155, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_01_14, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)