alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Cisco ISE StrongSwan API Unauthenticated Remote Code Execution (CVE-2025-20337)"; flow:established,to_server; http.uri; content:"/api/v1/strongswan/tunnel"; fast_pattern; http.request_body; content:"|22|tunnel_config|22 3a|"; pcre:"/^\s*\x22(?:[A-Za-z0-9\x2b\x2f\x3d]|\x25(?:2[bBfF]|3[dD]))+/R"; http.method; content:"POST"; reference:url,github.com/B1ack4sh/Blackash-CVE-2025-20337/blob/main/CVE-2025-20337.yaml; reference:cve,2025-20337; classtype:web-application-attack; sid:2065769; rev:1; metadata:affected_product Cisco_ISE, attack_target Server, tls_state TLSDecrypt, created_at 2025_11_14, cve CVE_2025_20337, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_14, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)