alert http any any -> $HOME_NET any (
msg:"ET WEB_SPECIFIC_APPS AvTech Config.cgi Network.NetworkFailureDetection.Address Parameter Command Injection Attempt (CVE-2025-57199)";
flow:established,to_server;
http.method;
content:"POST";
http.uri; bsize:24;
content:"/cgi-bin/user/Config.cgi"; fast_pattern;
http.request_body;
content:"action|3d|set";
content:"Network.NetworkFailureDetection.Address|3d|";
pcre:"/^[^\x26]*?(?:(?:\x3b|%3[Bb])|(?:\x0a|%0[Aa])|(?:\x60|%60)|(?:\x7c|%7[Cc])|(?:\x24|%24))+/R";
reference:url,xchg-rax-rax.github.io/2025/10/13/avtech_vulnerabilites.html;
reference:cve,2025-57199;
classtype:attempted-admin;
sid:2066003; rev:1;
metadata:affected_product AvTech, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_12_03, cve CVE_2025_57199, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_12_03, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
target:dest_ip;
)