alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS D-Link DI-8100 yyxz.asp Stack Buffer Overflow (CVE-2026-7851)"; flow:established,to_server; http.uri; bsize:9; content:"/yyxz.asp"; fast_pattern; http.request_body; content:"id|3d|"; pcre:"/^[^&]{100,}/R"; http.method; content:"POST"; reference:url,github.com/draw-ctf/report/blob/main/DI-8100/yyxz_dlink_asp_overflow.md; reference:cve,2026-7851; classtype:web-application-attack; sid:2069188; rev:1; metadata:affected_product D_Link, attack_target Server, tls_state TLSDecrypt, created_at 2026_05_06, cve CVE_2026_7851, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_05_06, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)