CVE-2021-42237VulnerabilityPublished 03/25/2022Updated 10/24/2026

CVE-2021-42237: Sitecore XP Remote Command Execution Vulnerability

Affects Sitecore XPSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 03/25/2022
KEV deadline: 04/15/2022
Ransomware: Used in ransomware campaigns
EPSS: 97.6% chance of exploitation in 30 days – higher than 99% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2021-42237 (opens in a new tab)

Description

CVE-2021-42237 is a high-severity vulnerability in Sitecore XP involving insecure deserialization that enables remote code execution. It has been exploited in the wild and is known to be used in ransomware campaigns.

Summary

Sitecore XP contains an insecure deserialization vulnerability (CWE-502) that allows attackers to execute arbitrary code remotely. This vulnerability has been actively exploited in the wild and has been associated with ransomware campaigns targeting affected systems.

Impact

Successful exploitation of this vulnerability can lead to remote code execution on affected Sitecore XP installations, potentially allowing attackers to take full control of the system, execute malicious payloads, and deploy ransomware.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.

Weaknesses

CWE-502Deserialization of Untrusted Data (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 11:11:02 UTC

Weaknesses

References

Related threats