ET WEB_SPECIFIC_APPS TP-Link WlanNetworkRpm.htm ssid Parameter Command Injection Attempt (CVE-2023-33538)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS TP-Link WlanNetworkRpm.htm ssid Parameter Command Injection Attempt (CVE-2023-33538)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/userRpm/WlanNetworkRpm.htm|3f|"; startswith; fast_pattern;
    content:"ssid|3d|"; distance:0;
    pcre:"/^[^\x26]*?(?:(?:\x3b|%3[Bb])|(?:\x0a|%0[Aa])|(?:\x60|%60)|(?:\x7c|%7[Cc])|(?:\x24|%24))+/R";
    reference:url,origin-unit42.paloaltonetworks.com/exploitation-of-cve-2023-33538/;
    reference:cve,2023-33538;
    classtype:attempted-admin;
    sid:2071266; rev:1;
    metadata:affected_product TP_LINK, attack_target Networking_Equipment, tls_state plaintext, created_at 2026_07_22, cve CVE_2023_33538, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2026_07_22, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)