ET WEB_SPECIFIC_APPS Tenda SetRemoteWebCfg remoteIp Parameter Buffer Overflow Attempt (CVE-2025-5853)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS Tenda SetRemoteWebCfg remoteIp Parameter Buffer Overflow Attempt (CVE-2025-5853)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri; bsize:23;
    content:"/goform/SetRemoteWebCfg"; fast_pattern;
    http.request_body;
    content:"remoteIp";
    pcre:"/^[^\x2c\x7d$]{100,}(?:\x2c|\x7d|$)/R";
    reference:url,candle-throne-f75.notion.site/Tenda-AC15-formSetSafeWanWebMan-20adf0aa1185806daab3ebe0036266cb;
    reference:cve,2025-5853;
    classtype:web-application-attack;
    sid:2062821; rev:1;
    metadata:affected_product Tenda, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_06_09, cve CVE_2025_5853, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, updated_at 2025_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;
)