Description of the security update for Office Online Server: March 9, 2021 (KB4493229)

Summary

This security update resolves a Microsoft Excel Remote Code Execution Vulnerability. To learn more about the vulnerability, see the following security advisories:

Note: To apply this security update, you must have the release version of Microsoft Office Online Server installed on the computer.

Improvements and fixes

This update fixes a crash that occurs when you load Open Document Format (ODF) files that contain charts that include certain kinds of trendlines.

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 4493229 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: March 9, 2021 (KB5001208).

Security update replacement information

This security update replaces previously released security update 4493192.

File hash information

File name	SHA1 hash	SHA256 hash
wacserver2019-kb4493229-fullfile-x64-glb.exe	C35F2495DAF2E4559C32469128467F6A475650E7	36E246E084E3D43D0A07C90C103199A24784DA9B8E2E58970596367A83D2C761

File information

Download the list of files that are included in security update 4493229.

Information about protection and security

Protect yourself online: Windows Security support

Learn how we guard against cyber threats: Microsoft Security