Vulnerability Report

CVE-2021-42237

RCE CISA KEV Active

Title: Insecure Deserialization in Sitecore XP

RCE

Proof Of Concept

PoC Available for CVE-2021-42237

CWE Category CWE-502
Published Date Nov 05, 2021
Modified Date Nov 10, 2025
Exploit Status Available
Score 9.8 CVSS v3.1
Exploit Probability (EPSS)
99.21%

Vulnerability Summary

CVE-2021-42237: 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.

Impacted Vendors

S
sitecore 1

Reference Links

http://packetstormsecurity.com/files/164988/Sitecore-Experience-Platform-XP-Remote-Code-Execution.html http://sitecore.com https://blog.assetnote.io/2021/11/02/sitecore-rce/ https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1000776 http://packetstormsecurity.com/files/164988/Sitecore-Experience-Platform-XP-Remote-Code-Execution.html http://sitecore.com https://blog.assetnote.io/2021/11/02/sitecore-rce/ https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1000776 https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42237
CVSS v3.1
Source Entity [email protected]
Severity CRITICAL
9.8
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v3.1
Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0
Severity CRITICAL
9.8
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v2.0
Source Entity [email protected]
Severity HIGH
10.0
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:L/Au:N/C:C/I:C/A:C

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-42237 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/ItsIgnacioPortal/CVE-2021-42237
View Code
GitHub https://github.com/vesperp/CVE-2021-42237-SiteCore-XP
View Code
GitHub https://github.com/crankyyash/SiteCore-RCE-Detection
View Code
MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Stack

No specific products linked.