ET EXPLOIT Exim receive_msg Integer Overflow Attempt Inbound M2 (CVE-2020-28020)

Query · suricata

flow:established,to_server;
content:"|0a 09|";
content:"|0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a|"; fast_pattern;
isdataat:50000,relative;
Raw source ET EXPLOIT Exim receive_msg Integer Overflow Attempt Inbound M2 (CVE-2020-28020) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert smtp any any -> [$HOME_NET,$HTTP_SERVERS,$SMTP_SERVERS] any (
    msg:"ET EXPLOIT Exim receive_msg Integer Overflow Attempt Inbound M2 (CVE-2020-28020)";
    flow:established,to_server;
    content:"|0a 09|";
    content:"|0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a|"; fast_pattern;
    isdataat:50000,relative;
    reference:url,www.qualys.com/2021/05/04/21nails/21nails.txt;
    reference:cve,2020-28020;
    classtype:attempted-admin;
    sid:2032899; rev:1;
    metadata:attack_target SMTP_Server, created_at 2021_05_04, cve CVE_2020_28020, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_04;
)

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