Description of the security update for SharePoint Enterprise Server 2013: April 13, 2021 (KB4493170)

Summary

This security update resolves a Microsoft SharePoint denial-of-service attack vulnerability. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2021-28450.

**Note:**To apply this security update, you must have the release version of Service Pack 1 for Microsoft SharePoint Server 2013 installed on the computer.

How to get and install the update

Method 1: Microsoft Update

This update is available from Microsoft Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to get security updates automatically, see Windows Update: FAQ.

Method 2: Microsoft Update Catalog

To get the standalone package for this update, go to the Microsoft Update Catalog website.

Method 3: Microsoft Download Center

You can get the standalone update package through the Microsoft Download Center. Follow the installation instructions on the download page to install the update.

• Download security update 4493170 for the 64-bit version of SharePoint Enterprise Server 2013

More information

Security update deployment information

For deployment information about this update, see Security update deployment information: April 13, 2021.

Security update replacement information

This security update replaces previously released security update 4486723.

File hash information

File name	SHA1 hash	SHA256 hash
coreserverloc2013-kb4493170-fullfile-x64-glb.exe	956CD719B175A3D995F573AB623ACD8525C449CD	E2D901C66BB8F7C1D5B865D75E0B9B63BE6333DA51F81EFD12752A4C78F2C501

File information

Download the list of files that are included in security update 4493170.

Information about protection and security

Protect yourself online: Windows Security supportLearn how we guard against cyber threats: Microsoft Security