alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS D-Link DI-8100 user_group.asp Stack Buffer Overflow (CVE-2026-7857)"; flow:established,to_server; http.uri; bsize:15; content:"/user_group.asp"; fast_pattern; http.request_body; bsize:>100000; content:"opt|3d|"; content:"name|3d|"; reference:url,github.com/draw-ctf/report/blob/main/DI-8100/user_group_asp_overflow.md; reference:cve,2026-7857; classtype:web-application-attack; sid:2069191; rev:1; metadata:affected_product D_Link, attack_target Server, tls_state TLSDecrypt, created_at 2026_05_06, cve CVE_2026_7857, deployment Perimeter, deployment Internal, deployment SSLDecrypt, 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;)