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CVE-2021-31181: Microsoft SharePoint Remote Code Execution Vulnerability

• Severity: medium (CVSS 6.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 29.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-11 · updated 2026-06-17
• Weakness: CWE-94

Description

Microsoft SharePoint Remote Code Execution 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 16.0.5161.1000 — fixed in 16.0.5161.1000
• Microsoft SharePoint Foundation 2013 Service Pack 1: from 15.0.0 before 15.0.5345.1000 — fixed in 15.0.5345.1000
• Microsoft SharePoint Server: from 16.0.0 before 16.0.10374.20000 — fixed in 16.0.10374.20000

How to fix

Upgrade to a fixed version: Microsoft Sharepoint Enterprise Server 2016 16.0.5161.1000; Microsoft SharePoint Foundation 2013 Service Pack 1 15.0.5345.1000; Microsoft SharePoint Server 16.0.10374.20000. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/163208/Microsoft-SharePoint-Unsafe-Control-And-ViewState-Remote-Code-Execution.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31181
• https://www.zerodayinitiative.com/advisories/ZDI-21-573/
• http://packetstormsecurity.com/files/163208/Microsoft-SharePoint-Unsafe-Control-And-ViewState-Remote-Code-Execution.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31181
• https://www.zerodayinitiative.com/advisories/ZDI-21-573/
• https://packetstorm.news/files/id/163208

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