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CVE-2021-38651: Microsoft SharePoint Server Spoofing Vulnerability

• Severity: low (CVSS 3.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-15 · updated 2026-08-10

Description

Microsoft SharePoint Server Spoofing Vulnerability

Affected products

• Microsoft SharePoint Server: 2016
• Microsoft SharePoint Foundation 2013 Service Pack 1: 2013-sp1
• Microsoft SharePoint Server: 2019
• Microsoft Sharepoint Enterprise Server 2016: from 16.0.0 before 5215.1000 — fixed in 5215.1000
• Microsoft SharePoint Foundation 2013 Service Pack 1: from 15.0.0 before 5381.1000 — fixed in 5381.1000
• Microsoft SharePoint Server: from 16.0.0 before 10378.20002 — fixed in 10378.20002

How to fix

Upgrade to a fixed version: Microsoft Sharepoint Enterprise Server 2016 5215.1000; Microsoft SharePoint Foundation 2013 Service Pack 1 5381.1000; Microsoft SharePoint Server 10378.20002. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38651
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38651

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