ET WEB_SPECIFIC_APPS TrendNet NTPSyncWithHost.cgi Command Injection Attempt (CVE-2025-15137)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS TrendNet NTPSyncWithHost.cgi Command Injection Attempt (CVE-2025-15137)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/NTPSyncWithHost.cgi|3f|"; startswith; fast_pattern;
    pcre:"/^[^\x26]*?(?:(?:\x3b|%3[Bb])|(?:\x0a|%0[Aa])|(?:\x60|%60)|(?:\x7c|%7[Cc])|(?:\x24|%24))+/R";
    reference:url,pentagonal-time-3a7.notion.site/TRENDnet-TEW-800MB-NTP-2c7e5dd4c5a580f999adcaff2c31978b;
    reference:cve,2025-15137;
    classtype:attempted-admin;
    sid:2066748; rev:1;
    metadata:attack_target Networking_Equipment, tls_state plaintext, created_at 2026_01_14, cve CVE_2025_15137, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, 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;
)