ET WEB_SPECIFIC_APPS Linksys linsetIpv6 tunrd_Prefix Parameter Buffer Overflow Attempt (CVE-2025-9481)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS Linksys linsetIpv6 tunrd_Prefix Parameter Buffer Overflow Attempt (CVE-2025-9481)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri; bsize:15;
    content:"/goform/setIpv6"; fast_pattern;
    http.request_body;
    content:"tunrd_Prefix|3d|";
    pcre:"/^[^&]{100,}(?:&|$)/R";
    reference:url,github.com/wudipjq/my_vuln/blob/main/Linksys/vuln_35/35.md#poc;
    reference:cve,2025-9481;
    classtype:web-application-attack;
    sid:2064201; rev:1;
    metadata:affected_product Linksys, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_08_28, cve CVE_2025_9481, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_08_28, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)