alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Qwik Unauthenticated RCE via server$ Deserialization (CVE-2026-27971)"; flow:established,to_server; http.uri; content:"qfunc|3d|sync"; fast_pattern; http.header; content:"x-qrl|3a 20|"; nocase; http.request_body; content:"|22|_objs|22 3a|"; http.method; content:"POST"; reference:url,vulnerabletarget.com/detail.html?id=vt-2026-27971; reference:cve,2026-27971; classtype:web-application-attack; sid:2068291; rev:1; metadata:attack_target Server, tls_state TLSDecrypt, created_at 2026_03_17, cve CVE_2026_27971, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_03_17, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)