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

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2022-03-25. EPSS: 97.6% chance of exploitation in the next 30 days.

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.

Affected products

• Sitecore Experience Platform: version 7.5 only; version 8.0 only; version 8.1 only; version 8.2 only

Published 2021-11-05. Last modified 2026-07-09.