alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT TP-Link Archer AX21 Unauthenticated Command Injection Inbound (CVE-2023-1389)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/cgi-bin/luci"; fast_pattern; startswith; pcre:"/^(?:\x2f|%+(?:25)*2[fF])?(?:\x3b|%+(?:25)*3[bB])stok(?:\x3d|%+(?:25)*3[dD])(?:\x2f|%+(?:25)*2[fF])locale/R"; http.request_body; content:"operation|3d|write"; content:"country|3d|"; pcre:"/^[^&]*?(?:[\x3b\x24\x26\x60\x7c]|\x25(?:25)*(?:3[bB]|2[46]|60|7[cC])|\x5c[rn])/R"; reference:cve,2023-1389; reference:url,tenable.com/security/research/tra-2023-11; classtype:attempted-admin; sid:2044585; rev:2; metadata:affected_product TP_LINK, attack_target Networking_Equipment, tls_state TLSDecrypt, created_at 2023_03_14, cve CVE_2023_1389, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag CISA_KEV, updated_at 2026_10_21, mitre_tactic_id TA0008, mitre_tactic_name Lateral_Movement, mitre_technique_id T1210, mitre_technique_name Exploitation_Of_Remote_Services; target:dest_ip;)