alert tcp any any -> $HOME_NET any (msg:"ET EXPLOIT Dahua Loopback Authentication Bypass Attempt M1 (DHIP) (CVE-2021-33045)"; flow:established,to_server; content:"|20 00 00 00|DHIP"; startswith; fast_pattern; content:"|22|ipAddr|22 3a|"; content:"|22|127.0.0.1|22|"; within:15; content:"|22|loginType|22 3a|"; content:"|22|Loopback|22|"; within:15; content:"|22|clientType|22 3a|"; content:"|22|Local|22|"; within:15; reference:url,packetstorm.news/files/id/164423; reference:cve,2021-33044; reference:cve,2021-33045; classtype:attempted-admin; sid:2068365; rev:1; metadata:affected_product Dahua, attack_target Networking_Equipment, tls_state plaintext, created_at 2026_03_20, cve CVE_2021_33045, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, updated_at 2026_03_20, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)