What’s Vulnerable › Vulnerabilities

CVE-2021-28450: Microsoft SharePoint Denial of Service Vulnerability

• Severity: medium (CVSS 4.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-13 · updated 2026-06-17

Description

Microsoft SharePoint Denial of Service Vulnerability

Affected products

• Microsoft SharePoint Foundation 2013 Service Pack 1: 2010-sp2
• Microsoft SharePoint Server: 2013-sp1, 2016, 2019
• Microsoft SharePoint Enterprise Server 2013 Service Pack 1: from 15.0.0 before publication — fixed in publication
• Microsoft Sharepoint Enterprise Server 2016: from 16.0.0 before publication — fixed in publication
• Microsoft SharePoint Foundation 2013 Service Pack 1: from 13.0.0 before publication — fixed in publication
• Microsoft SharePoint Server: from 16.0.0 before publication — fixed in publication

How to fix

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

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28450
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28450

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