CVE-2021-42237

Sitecore XP Remote Command Execution Vulnerability

Critical 9.8
Exploited: added to CISA KEV 25 Mar 2022
Used in ransomware campaigns

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.

Key facts

Published: 5 Nov 2021
Last changed: 9 Jul 2026
Assigned by: mitre
KEV added: 25 Mar 2022
KEV fix due: 15 Apr 2022
Used in ransomware: Yes, according to CISA
EPSS: 97.399% likely to be exploited in the next 30 days, higher than 99.9% of CVEs (scores for 15 Nov 2026)
SSVC (CISA): Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

9.8CVSS 3.1, Criticalfrom CISA (ADP container)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What to do

Apply updates per vendor instructions.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Vendor	Product	Versions
n/a	n/a	n/a (affected)