alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT Possible Citrix ShareFile RCE Inbound (CVE-2021-22941)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"upload.aspx"; content:"id=../"; fast_pattern; content:"bp="; content:"accountid="; reference:url,codewhitesec.blogspot.com/2021/09/citrix-sharefile-rce-cve-2021-22941.html; reference:cve,2021-22941; classtype:attempted-admin; sid:2034033; rev:1; metadata:attack_target Server, created_at 2021_09_27, cve CVE_2021_22941, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2021_09_27, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)