Description of the security update for Office Online Server: May 11, 2021 (KB5001914)

Summary

This security update resolves a Microsoft Excel remote code execution vulnerability and Office information disclosure vulnerability. To learn more, see the following security advisories:

• Microsoft Common Vulnerabilities and Exposures CVE-2021-31174
• Microsoft Common Vulnerabilities and Exposures CVE-2021-31175
• Microsoft Common Vulnerabilities and Exposures CVE-2021-31177
• Microsoft Common Vulnerabilities and Exposures CVE-2021-31178
• Microsoft Common Vulnerabilities and Exposures CVE-2021-31179

**Note:**To apply this security update, you must have the release version of Microsoft Office Online Server 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 5001914 for the 64-bit version of Office Online Server

More information

Security update deployment information

For deployment information about this update, see Security update deployment information: May 11, 2021.

Security update replacement information

This security update replaces previously released security update 4504714.

File hash information

File name		SHA256 hash
wacserver2019-kb5001914-fullfile-x64-glb.exe		C33A6A5F9CF3127354AA4C9F43AB09A2785C6988550B8B200883C3DA41023085

File information

Download the list of files that are included in security update 5001914.

Information about protection and security

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