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CVE-2021-42294: Microsoft SharePoint Server Remote Code Execution Vulnerability

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-15 · updated 2026-06-17

Description

Microsoft SharePoint Server Remote Code Execution Vulnerability

Affected products

• Microsoft SharePoint Server: 2013-sp1, 2016
• Microsoft SharePoint Foundation 2013 Service Pack 1: 2013-sp1
• Microsoft SharePoint Server: 2019
• Microsoft SharePoint Enterprise Server 2013 Service Pack 1: from 15.0.0 before 15.0.5407.1000 — fixed in 15.0.5407.1000
• Microsoft SharePoint Server Subscription Edition: from 16.0.0 before 16.0.14326.20620 — fixed in 16.0.14326.20620
• Microsoft Sharepoint Enterprise Server 2016: from 16.0.0 before 16.0.5254.1000 — fixed in 16.0.5254.1000
• Microsoft SharePoint Foundation 2013 Service Pack 1: from 15.0.0 before 15.0.5407.1000 — fixed in 15.0.5407.1000
• Microsoft SharePoint Server: from 16.0.0 before 16.0.10381.20001 — fixed in 16.0.10381.20001
• Microsoft SharePoint Server Subscription Edition Language Pack: from 16.0.0 before 16.0.14326.20620 — fixed in 16.0.14326.20620

How to fix

Upgrade to a fixed version: Microsoft SharePoint Enterprise Server 2013 Service Pack 1 15.0.5407.1000; Microsoft SharePoint Server Subscription Edition 16.0.14326.20620; Microsoft Sharepoint Enterprise Server 2016 16.0.5254.1000; Microsoft SharePoint Foundation 2013 Service Pack 1 15.0.5407.1000; Microsoft SharePoint Server 16.0.10381.20001; Microsoft SharePoint Server Subscription Edition Language Pack 16.0.14326.20620. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42294
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42294

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