alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT PiHole Web Interface Regex Escape Leading to RCE Inbound M2 (CVE-2021-32706)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/admin/"; http.request_body; content:"clients=*"; fast_pattern; pcre:"/^(?:\x3b|\x0a|\x26|\x60|\x7C|\x24|\x3e)/R"; reference:url,www.cvedetails.com/cve/CVE-2021-32706/; reference:cve,2021-32706; classtype:attempted-admin; sid:2033935; rev:1; metadata:attack_target Server, created_at 2021_09_13, cve CVE_2021_32706, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, updated_at 2021_09_13, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)