alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT Citrix SD-WAN Unauthenticated RCE (CVE-2020-8271)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"|3a 2f 2f 3f 2f|collector|2f|"; fast_pattern; reference:cve,2020-8271; classtype:attempted-admin; sid:2035093; rev:1; metadata:attack_target Server, created_at 2022_02_03, cve CVE_2020_8271, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, updated_at 2022_02_03, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)