alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Citrix NetScaler Console Authenticated Arbitrary File Read (CVE-2025-4365)"; flow:established,to_server; http.uri; content:"/nitro/v1/download"; fast_pattern; http.header; content:"file|3a 20|"; nocase; content:"authorization|3a 20|"; nocase; http.method; content:"GET"; reference:url,www.rapid7.com/blog/post/cve-2025-4365-cve-unassigned-netscaler-console-sdx-authenticated-arbitrary-file-read-write-fixed/; reference:cve,2025-4365; classtype:web-application-attack; sid:2067198; rev:1; metadata:affected_product Netscaler, attack_target Server, tls_state TLSDecrypt, created_at 2026_01_30, cve CVE_2025_4365, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_01_30, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)