alert http $EXTERNAL_NET any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT Apache HTTP Server 2.4.49 - Path Traversal Attempt (CVE-2021-41773) M1"; flow:established,to_server; http.uri.raw; pcre:"/^\/(?:icons|cgi-bin)/"; content:"/.%2e/%2e%2e/%2e%2e/%2e%2e/"; reference:url,httpd.apache.org/security/vulnerabilities_24.html; reference:url,twitter.com/HackerGautam/status/1445412108863041544; reference:cve,2021-41773; classtype:attempted-admin; sid:2034124; rev:5; metadata:affected_product Apache_HTTP_server, created_at 2021_10_05, cve CVE_2021_41773, deployment Perimeter, deployment Internet, deployment Internal, confidence High, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_11_26, mitre_tactic_id TA0007, mitre_tactic_name Discovery, mitre_technique_id T1083, mitre_technique_name File_And_Directory_Discovery; target:dest_ip;)