alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Apache Tika XML External Entity Injection (CVE-2025-66516)"; flow:established,to_server; http.request_body; content:"|25|PDF|2d|1|2e|"; content:"|0a 2f|NeedAppearances|20|"; fast_pattern; content:"|0a 2f|XFA|20|"; content:"|3c 21|ENTITY|20|"; distance:0; content:"|20|SYSTEM|20|"; distance:0; reference:url,xz.aliyun.com/news/90783; reference:cve,2025-66516; classtype:web-application-attack; sid:2066322; rev:1; metadata:affected_product Apache_Tika, attack_target Server, tls_state TLSDecrypt, created_at 2025_12_15, cve CVE_2025_66516, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2025_12_15, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)