---
id: CVE-2021-42237
title: >-
  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
summary: >-
  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 requir…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-502
  - CWE-502
vendor: sitecore
product: experience_platform
affected:
  - experience_platform = 7.5
  - experience_platform = 8.0
  - experience_platform = 8.1
  - experience_platform = 8.2
published: '2021-11-05'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-42237'
references:
  - url: >-
      http://packetstormsecurity.com/files/164988/Sitecore-Experience-Platform-XP-Remote-Code-Execution.html
    label: cve@mitre.org
  - url: 'https://blog.assetnote.io/2021/11/02/sitecore-rce/'
    label: cve@mitre.org
  - url: >-
      https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1000776
    label: cve@mitre.org
  - url: >-
      http://packetstormsecurity.com/files/164988/Sitecore-Experience-Platform-XP-Remote-Code-Execution.html
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://sitecore.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://blog.assetnote.io/2021/11/02/sitecore-rce/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1000776
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42237
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - kev
  - in-the-wild
  - exploit-available
epss: 0.97904
epssPercentile: 0.99906
kev: true
kevDateAdded: '2022-03-25'
kevDueDate: '2022-04-15'
kevRansomware: true
exploited: true
zeroDay: true
ingestedAt: '2026-07-06T01:08:17.057Z'
exploits:
  github: 3
  githubRepos:
    - 'https://github.com/ItsIgnacioPortal/CVE-2021-42237'
    - 'https://github.com/vesperp/CVE-2021-42237-SiteCore-XP'
    - 'https://github.com/crankyyash/SiteCore-RCE-Detection'
  metasploit:
    - exploit/windows/http/sitecore_xp_cve_2021_42237
  nuclei:
    - CVE-2021-42237
  checkedAt: '2026-09-21T15:24:32.987Z'
exploitAvailable: true
---

## Overview

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

- `experience_platform = 7.5`
- `experience_platform = 8.0`
- `experience_platform = 8.1`
- `experience_platform = 8.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.