ET EXPLOIT Zyxel NAS RCE Attempt Inbound (CVE-2020-9054) M2

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/adv,/cgi-bin/weblogin.cgi"; startswith; fast_pattern;
http.request_body;
content:"username="; startswith;
pcre:"/^.{0,18}(?:\x27|%27)(?:\x3b|%3[Bb])/R";
Raw source ET EXPLOIT Zyxel NAS RCE Attempt Inbound (CVE-2020-9054) M2 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET EXPLOIT Zyxel NAS RCE Attempt Inbound (CVE-2020-9054) M2";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/adv,/cgi-bin/weblogin.cgi"; startswith; fast_pattern;
    http.request_body;
    content:"username="; startswith;
    pcre:"/^.{0,18}(?:\x27|%27)(?:\x3b|%3[Bb])/R";
    reference:cve,2020-9054;
    reference:url,www.zyxel.com/support/remote-code-execution-vulnerability-of-NAS-products.shtml;
    reference:url,www.kb.cert.org/vuls/id/498544/;
    classtype:attempted-admin;
    sid:2029617; rev:3;
    metadata:attack_target Networking_Equipment, created_at 2020_03_12, cve CVE_2020_9054, deployment Perimeter, confidence Medium, signature_severity Major, tag CISA_KEV, updated_at 2025_07_10;
)

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