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Vulnerabilities

Vulnerability · CVE-2021-42237

Sitecore XP Remote Command Execution Vulnerability

Published Nov 5, 2021 · catalog updated Jul 9, 2026 · Sitecore XP

Patch now

CVE-2021-42237 is in the CISA known-exploited catalog, due Apr 15, 2022. Confirm Sitecore XP against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
97.57%
Remediation
Remediation guidance
Affected products
cpe sitecore/experience platform · vendor Sitecore XP

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe sitecore/experience platform7.5
  • cpe sitecore/experience platform8.0
  • vendor Sitecore XPversion unspecified

How to fix CVE-2021-42237

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-42237 is in the CISA known-exploited catalog, due Apr 15, 2022. Confirm Sitecore XP against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with sitecore/experience platform 7.5; sitecore/experience platform 8.0. Apply updates per vendor instructions.

What should an analyst verify?

CWE-502: Deserialization of Untrusted Data. EPSS 97.57%. The CISA KEV listing is the exploitation evidence. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 5, 2021 · Catalog

    Detected

    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.

  2. Mar 25, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Apr 15, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jul 9, 2026 · Catalog

    Updated

    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.

Sources

  • CISA KEVConfirmed exploitationCVE-2021-42237

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

    cisa.gov
  • CVE.orgVulnerability recordCVE-2021-42237

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-42237

    30-day exploitation probability 97.6%

    first.org
  • Metasploit ModulesPublic exploit moduleexploit_windows/http/sitecore_xp_cve_2021_42237

    Public module reference (excellent). Module source is not copied into this catalog.

    rapid7.com
  • NIST NVDVulnerability recordCVE-2021-42237

    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.

    nvd.nist.gov
  • Packet Storm SecurityCited referencehttp://packetstormsecurity.com/files/164988/Sitecore-Experience-Platform-XP-Remote-Code-Execution.html

    Packet Storm link already published on the finding.

    packetstormsecurity.com
  • VulnCheck KEVConfirmed exploitationCVE-2021-42237

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

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.