ET WEB_SPECIFIC_APPS Tenda GstDhcpSetSer dips Parameter Buffer Overflow Attempt (CVE-2026-3399)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS Tenda GstDhcpSetSer dips Parameter Buffer Overflow Attempt (CVE-2026-3399)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri; bsize:21;
    content:"/goform/GstDhcpSetSer"; fast_pattern;
    http.request_body;
    content:"dips|3d|";
    pcre:"/^[^&]{100,}(?:&|$)/R";
    reference:url,github.com/advisories/GHSA-qgr9-jc5r-hw74;
    reference:cve,2026-3399;
    classtype:web-application-attack;
    sid:2069687; rev:1;
    metadata:affected_product Tenda, attack_target Networking_Equipment, tls_state plaintext, created_at 2026_06_09, cve CVE_2026_3399, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_06_09, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)