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

> CVE-2021-42237: Sitecore XP Remote Command Execution Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-42237
Last updated: 2026-07-09T00:15:11Z

- Published: 2021-11-05 09:51 UTC · Updated: 2026-07-09 00:15 UTC · Assigner: mitre
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 97.6%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-03-25, federal due date 2022-04-15, ransomware use: Known

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Sitecore: XP

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-42237)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-42237)
- [http://packetstormsecurity.com/files/164988/Sitecore-Experience-Platform-XP-Remote-Code-Execution.html](http://packetstormsecurity.com/files/164988/Sitecore-Experience-Platform-XP-Remote-Code-Execution.html)
- [https://blog.assetnote.io/2021/11/02/sitecore-rce/](https://blog.assetnote.io/2021/11/02/sitecore-rce/)
- [https://support.sitecore.com/kb?id=kb\_article\_view&sysparm\_article=KB1000776](https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1000776)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-42237 · Markdown: https://rewindex.com/cve/CVE-2021-42237.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-42237 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:15:36.384Z