alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS D-Link showMACfilterMAC flag_5g Parameter Buffer Overflow Attempt (CVE-2023-43239)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:24; content:"/goform/showMACfilterMAC"; fast_pattern; http.request_body; content:"flag_5g|3d|"; pcre:"/^[^&]{100,}(?:&|$)/R"; reference:url,github.com/peris-navince/founded-0-days/blob/main/Dlink/816/showMACfilterMAC/1.md; reference:cve,2023-43239; classtype:web-application-attack; sid:2065140; rev:1; metadata:affected_product D_Link, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_10_10, cve CVE_2023_43239, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_10, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)