alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT NodeJS System Information Library Command Injection Attempt (CVE-2021-21315)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/api/getServices?name"; fast_pattern; startswith; pcre:"/^.*\x3d[^\x26]*?(?:(?:\x3b|%3[Bb])|(?:\x0a|%0[Aa])|(?:\x60|%60)|(?:\x7c|%7[Cc])|(?:\x24|%24))+/R"; reference:cve,2021-21315; reference:url,github.com/ForbiddenProgrammer/CVE-2021-21315-PoC; classtype:attempted-admin; sid:2034973; rev:3; metadata:affected_product Node_js, attack_target Web_Server, created_at 2022_01_25, cve CVE_2021_21315, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_08_20, mitre_tactic_id TA0008, mitre_tactic_name Lateral_Movement, mitre_technique_id T1210, mitre_technique_name Exploitation_Of_Remote_Services; target:dest_ip;)