alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT Cisco HyperFlex OS Command Injection M1 (CVE-2021-1497)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/auth"; startswith; http.request_body; content:"username="; content:"password="; nocase; fast_pattern; content:"%3b"; distance:0; pcre:"/^(?:%[a-f0-9]{2}){5,}/R"; reference:url,swarm.ptsecurity.com/cisco-hyperflex-how-we-got-rce-through-login-form-and-other-findings/; reference:cve,2021-1497; classtype:attempted-admin; sid:2034043; rev:1; metadata:attack_target Server, created_at 2021_09_29, cve CVE_2021_1497, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_29, mitre_tactic_id TA0008, mitre_tactic_name Lateral_Movement, mitre_technique_id T1210, mitre_technique_name Exploitation_Of_Remote_Services;)