ET WEB_SERVER SonicWall SMA Heap-Based Buffer Overflow (CVE-2021-20043)

Query · suricata

flow:established,to_server;
flowbits:isset,ET.SW.Bookmark;
http.method;
content:"POST";
http.uri;
content:"/cgi-bin/sonicfiles|3f|"; fast_pattern;
content:"RacNumber|3d|35";
target:dest_ip;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET WEB_SERVER SonicWall SMA Heap-Based Buffer Overflow (CVE-2021-20043) · 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 WEB_SERVER SonicWall SMA Heap-Based Buffer Overflow (CVE-2021-20043)";
    flow:established,to_server;
    flowbits:isset,ET.SW.Bookmark;
    http.method;
    content:"POST";
    http.uri;
    content:"/cgi-bin/sonicfiles|3f|"; fast_pattern;
    content:"RacNumber|3d|35";
    reference:url,www.nccgroup.com/us/research-blog/technical-advisory-sonicwall-sma-100-series-heap-based-buffer-overflow-cve-2021-20043/;
    reference:cve,2021-20043;
    classtype:web-application-attack;
    sid:2061729; rev:1;
    metadata:affected_product SonicWall, attack_target Server, tls_state TLSDecrypt, created_at 2025_04_18, cve CVE_2021_20043, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2025_04_18, 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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