alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Totolink setIpv6LanCfg addrPrefixLen Parameter Command Injection Attempt (CVE-2026-5853)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:20; content:"/cgi-bin/cstecgi.cgi"; http.request_body; content:"|22|topicurl|22|"; content:"|22|setIpv6LanCfg|22|"; fast_pattern; within:20; content:"|22|addrPrefixLen|22|"; pcre:"/^(?:\x3a(?:\x20\x22|\x22))?[^\x2c\x7d$]*?(?:(?:\x3b|%3[Bb])|(?:\x0a|%0[Aa])|(?:\x60|%60)|(?:\x7c|%7[Cc])|(?:\x24|%24))+/R"; reference:url,github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_159/README.md; reference:cve,2026-5853; classtype:attempted-admin; sid:2068922; rev:1; metadata:affected_product TOTOLINK, attack_target Networking_Equipment, tls_state plaintext, created_at 2026_04_22, cve CVE_2026_5853, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_04_22, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)