alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT Telesquare SDT-CW3B1 1.1.0 - OS Command Injection (CVE-2021-46422)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/cgi-bin/admin.cgi?Command=sysCommand&Cmd="; fast_pattern; startswith; http.header_names; content:!"Referer"; reference:cve,2021-46422; reference:url,twitter.com/momika233/status/1528742287072980992; classtype:attempted-admin; sid:2036663; rev:1; metadata:attack_target Networking_Equipment, created_at 2022_05_23, cve CVE_2021_46422, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_23, reviewed_at 2024_09_12, mitre_tactic_id TA0008, mitre_tactic_name Lateral_Movement, mitre_technique_id T1210, mitre_technique_name Exploitation_Of_Remote_Services;)