Sigma rule: Sitecore Pre-Auth RCE CVE-2021-42237

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-cebaf3d269e6, updated 2023-01-02T00:00:00.000Z.

Rule

Title
Sitecore Pre-Auth RCE CVE-2021-42237
Status
test
Level
high
Author
Florian Roth (Nextron Systems)
Date
2021-11-17
Modified
2023-01-02
File
rules-emerging-threats/2021/Exploits/CVE-2021-42237/web_cve_2021_42237_sitecore_report_ashx.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects exploitation attempts of Sitecore Experience Platform Pre-Auth RCE CVE-2021-42237 found in Report.ashx

Log source

category
webserver

Detection

selection:
    cs-method: 'POST'
    cs-uri-query|contains: '/sitecore/shell/ClientBin/Reporting/Report.ashx'
    sc-status: 200
condition: selection

False positives (as the rule lists them)

  • Vulnerability Scanning

Tags

  • attack.initial-access
  • attack.t1190
  • cve.2021-42237
  • detection.emerging-threats

CVEs this rule names

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/Exploits/CVE-2021-42237/web_cve_2021_42237_sitecore_report_ashx.yml

Sources and licences

  • SigmaHQ

    "Sitecore Pre-Auth RCE CVE-2021-42237" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/Exploits/CVE-2021-42237/web_cve_2021_42237_sitecore_report_ashx.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Sitecore Pre-Auth RCE CVE-2021-42237",
entity page, dataset version ref-cebaf3d269e6, updated 2023-01-02T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/20c6ed1c-f7f0-4ea3-aa65-4f198e6acb0f (accessed 2026-11-03).
Underlying source: SigmaHQ rule 20c6ed1c-f7f0-4ea3-aa65-4f198e6acb0f, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.