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

Description

None ## 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](<https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28450>). **Note: **To apply this security update, you must have the release version of [Service Pack 1 for Microsoft SharePoint Server 2013](<http://support.microsoft.com/kb/2880552>) 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](<https://support.microsoft.com/en-us/help/12373/windows-update-faq>). ### Method 2: Microsoft Update Catalog To get the standalone package for this update, go to the [Microsoft Update Catalog](<http://www.catalog.update.microsoft.com/Search.aspx?q=KB4493170>) 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 icon](https://support.content.office.net/en-us/media/2ae362dc-2179-d733-e930-e231c68a2c4a.png)[Download security update 4493170 for the 64-bit version of SharePoint Enterprise Server 2013](<http://www.microsoft.com/download/details.aspx?familyid=618323ea-078a-4f01-a48c-1831d9aa9f38>) ## More information ### Security update deployment information For deployment information about this update, see [Security update deployment information: April 13, 2021](<https://support.microsoft.com/help/5001866>). ### Security update replacement information This security update replaces previously released security update [4486723](<http://support.microsoft.com/kb/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](<https://download.microsoft.com/download/1/a/2/1a2591c5-1fe7-4a77-a300-1a65e1b5809e/4493170.csv>). ## Information about protection and security Protect yourself online: [Windows Security support](<https://support.microsoft.com/hub/4099151>)Learn how we guard against cyber threats: [Microsoft Security](<https://www.microsoft.com/security>)


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