ET WEB_SPECIFIC_APPS Sitecore XP Unauthenticated Remote Code Execution in Report.ashx (CVE-2021-42237)

Query · suricata

flow:established,to_server;
http.uri;
content:"/sitecore/shell/ClientBin/Reporting/Report.ashx"; fast_pattern;
http.request_body;
content:"<parameters>";
content:"Serialization/Arrays|22|"; distance:0;
pcre:"/^[^\x3e]*?\x3e(?:cmd|pwsh|powershell)/R";
http.method;
content:"POST";
target:dest_ip;
Raw source ET WEB_SPECIFIC_APPS Sitecore XP Unauthenticated Remote Code Execution in Report.ashx (CVE-2021-42237) · 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_SPECIFIC_APPS Sitecore XP Unauthenticated Remote Code Execution in Report.ashx (CVE-2021-42237)";
    flow:established,to_server;
    http.uri;
    content:"/sitecore/shell/ClientBin/Reporting/Report.ashx"; fast_pattern;
    http.request_body;
    content:"<parameters>";
    content:"Serialization/Arrays|22|"; distance:0;
    pcre:"/^[^\x3e]*?\x3e(?:cmd|pwsh|powershell)/R";
    http.method;
    content:"POST";
    reference:url,www.assetnote.io/resources/research/sitecore-experience-platform-pre-auth-rce-cve-2021-42237;
    reference:cve,2021-42237;
    classtype:web-application-attack;
    sid:2065043; rev:1;
    metadata:affected_product Sitecore, attack_target Server, tls_state TLSDecrypt, created_at 2025_10_03, cve CVE_2021_42237, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_03, 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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