alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Ivanti Connect Secure Buffer Overflow (X-Forwarded-For) (CVE-2025-22457)"; flow:established,to_server; http.header; content:"x-forwarded-for|3a 20|"; nocase; pcre:"/^[0-9\x2e]{16,}/R"; reference:url,labs.watchtowr.com/is-the-sofistication-in-the-room-with-us-x-forwarded-for-and-ivanti-connect-secure-cve-2025-22457/; reference:cve,2025-22457; classtype:web-application-attack; sid:2061292; rev:1; metadata:affected_product Ivanti, attack_target Server, tls_state TLSDecrypt, created_at 2025_04_04, cve CVE_2025_22457, deployment Perimeter, deployment Internal, deployment SSLDecrypt, performance_impact Significant, confidence Medium, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2025_04_04, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)