ET EXPLOIT Dahua Loopback Authentication Bypass Attempt M2 (http) (CVE-2021-33044)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri; bsize:11;
content:"/RPC2_Login"; fast_pattern;
http.request_body;
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;
target:dest_ip;
Raw source ET EXPLOIT Dahua Loopback Authentication Bypass Attempt M2 (http) (CVE-2021-33044) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http any any -> $HOME_NET any (
    msg:"ET EXPLOIT Dahua Loopback Authentication Bypass Attempt M2 (http) (CVE-2021-33044)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri; bsize:11;
    content:"/RPC2_Login"; fast_pattern;
    http.request_body;
    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;
    classtype:attempted-admin;
    sid:2068366; rev:1;
    metadata:affected_product Dahua, attack_target Networking_Equipment, tls_state plaintext, created_at 2026_03_20, cve CVE_2021_33044, 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;
)

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