alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS D-Link lan Multiple Parameters Buffer Overflow Attempt (CVE-2021-27114)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:11; content:"/goform/lan"; fast_pattern; http.request_body; pcre:"/s_(?:mac|ip)\x3d[^&]{100,}(?:&|$)/"; reference:url,github.com/yifan20020708/SGTaint-0-day/blob/main/DLink/DLink-DIR-816/1.md; reference:cve,2021-27114; classtype:web-application-attack; sid:2065763; rev:1; metadata:affected_product D_Link, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_11_13, cve CVE_2021_27114, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_13, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)