CVE-2021-42237
Summary
| CVE | CVE-2021-42237 |
|---|---|
| State | PUBLISHED |
| Assigner | mitre |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2021-11-05 10:15:08 UTC |
| Updated | 2026-07-09 13:57:14 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 9.8 CRITICAL from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.979040000 probability, percentile 0.999030000 (date 2026-07-22)
CISA KEV: Listed on 2022-03-25; due 2022-04-15; ransomware use Known
Problem Types: CWE-502 | n/a | CWE-502 CWE-502 Deserialization of Untrusted Data
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | ADP | DECLARED | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 2.0 | [email protected] | Primary | 10 | AV:N/AC:L/Au:N/C:C/I:C/A:C |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v2.0 Breakdown
Access Vector
NetworkAccess Complexity
LowAuthentication
NoneConfidentiality
CompleteIntegrity
CompleteAvailability
CompleteAV:N/AC:L/Au:N/C:C/I:C/A:C
CISA Known Exploited Vulnerability
| Vendor | Sitecore |
|---|---|
| Product | XP |
| Name | Sitecore XP Remote Command Execution Vulnerability |
| Required Action | Apply updates per vendor instructions. |
| Notes | https://nvd.nist.gov/vuln/detail/CVE-2021-42237 |
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Sitecore | Experience Platform | 7.5 | - | All | All |
| Application | Sitecore | Experience Platform | 7.5 | update1 | All | All |
| Application | Sitecore | Experience Platform | 7.5 | update2 | All | All |
| Application | Sitecore | Experience Platform | 8.0 | - | All | All |
| Application | Sitecore | Experience Platform | 8.0 | sp1 | All | All |
| Application | Sitecore | Experience Platform | 8.0 | update1 | All | All |
| Application | Sitecore | Experience Platform | 8.0 | update2 | All | All |
| Application | Sitecore | Experience Platform | 8.0 | update3 | All | All |
| Application | Sitecore | Experience Platform | 8.0 | update4 | All | All |
| Application | Sitecore | Experience Platform | 8.0 | update5 | All | All |
| Application | Sitecore | Experience Platform | 8.0 | update6 | All | All |
| Application | Sitecore | Experience Platform | 8.0 | update7 | All | All |
| Application | Sitecore | Experience Platform | 8.1 | - | All | All |
| Application | Sitecore | Experience Platform | 8.1 | update1 | All | All |
| Application | Sitecore | Experience Platform | 8.1 | update2 | All | All |
| Application | Sitecore | Experience Platform | 8.1 | update3 | All | All |
| Application | Sitecore | Experience Platform | 8.2 | - | All | All |
| Application | Sitecore | Experience Platform | 8.2 | update1 | All | All |
| Application | Sitecore | Experience Platform | 8.2 | update2 | All | All |
| Application | Sitecore | Experience Platform | 8.2 | update3 | All | All |
| Application | Sitecore | Experience Platform | 8.2 | update4 | All | All |
| Application | Sitecore | Experience Platform | 8.2 | update5 | All | All |
| Application | Sitecore | Experience Platform | 8.2 | update6 | All | All |
| Application | Sitecore | Experience Platform | 8.2 | update7 | All | All |
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| Sitecore Experience Platform (XP) Remote Code Execution ≈ Packet Storm | af854a3a-2127-422b-91ae-364da2661108 | packetstormsecurity.com | Third Party Advisory, VDB Entry |
| Sitecore Experience Platform Pre-Auth RCE – Assetnote | af854a3a-2127-422b-91ae-364da2661108 | blog.assetnote.io | Exploit, Third Party Advisory |
| %kb_name - %short_descr - Knowledge Portal | af854a3a-2127-422b-91ae-364da2661108 | support.sitecore.com | Vendor Advisory |
| www.cisa.gov/known-exploited-vulnerabilities-catalog | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | www.cisa.gov | US Government Resource |
| Digital Experience Platform and Content Hub for Digital Transformation | Sitecore | MITRE | sitecore.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
| CISA Known Exploited Vulnerabilities catalog | CISA | www.cisa.gov | kev |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2022-03-25T00:00:00.000Z | CVE-2021-42237 added to CISA KEV |
Legacy QID Mappings
- 14012 Sitecore Experience Platform Deserialization of Untrusted Data Vulnerability