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CVE-2021-42237

Sitecore XP Remote Command Execution

9.8 CRITICALActively exploited (CISA KEV)Used in ransomwarePublic exploitEPSS 97.6%
  1. Published5 Nov 2021
  2. Added to CISA KEV25 Mar 2022
  3. Remediation due15 Apr 2022
Actively exploited (CISA KEV)

Sitcore XP contains an insecure deserialization vulnerability which can allow for remote code execution.

Added to KEV: 25 Mar 2022Federal remediation due: 15 Apr 2022Used in ransomware

Description

Sitecore XP 7.5 Initial Release to Sitecore XP 8.2 Update-7 is vulnerable to an insecure deserialization attack where it is possible to achieve remote command execution on the machine. No authentication or special configuration is required to exploit this vulnerability.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Sitecore Experience Platform7.5 · 8.0 · 8.1 · 8.2

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2021-42237 being actively exploited?

Yes. CVE-2021-42237 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 25 Mar 2022. It has been used in ransomware campaigns.

How severe is CVE-2021-42237?

CVE-2021-42237 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 97.6% probability of exploitation.

Which products are affected by CVE-2021-42237?

Affected products include Sitecore Experience Platform.

How do I fix CVE-2021-42237?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-42237 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.