ET WEB_SERVER Cisco ASA/FTD Authenticated Buffer Overflow (CVE-2025-20333)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SERVER Cisco ASA/FTD Authenticated Buffer Overflow (CVE-2025-20333)";
    flow:established,to_server;
    http.uri;
    content:"/+CSCOE+/files/file_action.html"; fast_pattern;
    content:!"fs|3d|";
    content:"mode|3d|upload";
    content:"server|3d|";
    content:"path|3d|";
    http.cookie;
    content:"webvpn|3d|";
    http.content_type;
    pcre:"/^[^\x3b]*?\x3b\s*?[^\x3d]+\x3d[^$]{8192,}/";
    reference:url,attackerkb.com/topics/Szq5u0xgUX/cve-2025-20362/rapid7-analysis;
    reference:cve,2025-20333;
    classtype:web-application-attack;
    sid:2065052; rev:1;
    metadata:affected_product Cisco_ASA, affected_product Cisco_FTD, attack_target Server, tls_state TLSDecrypt, created_at 2025_10_06, cve CVE_2025_20333, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_06, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)