Is CVE-2021-42237 in the CISA KEV catalog?

Yes. CVE-2021-42237 is on the CISA Known Exploited Vulnerabilities list, added 2022-03-25, and has known ransomware campaign use.

What is the CVSS severity of CVE-2021-42237?

CVE-2021-42237 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2021-42237?

CVE-2021-42237 has an EPSS score of 99.21% (100th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2021-42237

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

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.

CWE-502Deserialization of Untrusted Data

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

99.21%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Sitecore XP Remote Command Execution Vulnerability

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

Apply updates per vendor instructions.

Remediation due: 2022-04-15

Associated with ransomware campaigns

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-10.