Summary

This security update resolves a Microsoft Office remote code execution vulnerability. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2021-28449.

Note: To apply this security update, you must have the release version of Service Pack 2 for Office 2010 installed on the computer.

Be aware that the update in the Microsoft Download Center applies to the Microsoft Installer (.msi)-based edition of Office 2010. It doesn't apply to the Office 2010 Click-to-Run editions, such as Microsoft Office 2010 Home and Student (see What version of Office am I using?). 

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.

More information

Security update deployment information

For deployment information about this update, see Security update deployment information: April 13, 2021 (KB5001866).

Security update replacement information

This security update replaces previously released security update 4504703.

File hash information

File name

SHA1 hash

SHA256 hash

mso2010-kb4504738-fullfile-x86-glb.exe

13F02384D11B64DEF5DAB3D0F5E91CF33AA32A0F

EAB6F768FC7FA5D7C1C4027483C67E8F799B9B2317035497EAEE7AC7B9709CFF

mso2010-kb4504738-fullfile-x64-glb.exe

18FA6A66C3A9BBAB1FAD91E5B63B34AAF3B888D0

8F91A712C7CDEAED36C05EA776DDC14ABEBA6DFACBE69D516245733CFD196ADF

File information

The English (United States) version of this software update installs files that have the attributes that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.

File identifier

File name

File version

File size

Date

Time

mso.dll.x86

mso.dll

14.0.7268.5000

18,482,384

16-Mar-2021

08:31

File identifier

File name

File version

File size

Date

Time

mso.dll.x64

mso.dll

14.0.7268.5000

24,368,336

16-Mar-2021

08:38

mso.dll.x86

mso.dll

14.0.7268.5000

18,482,384

16-Mar-2021

08:31

Information about protection and security

Protect yourself online: Windows Security support

Learn how we guard against cyber threats: Microsoft Security

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