Description of the security update for Office 2013: April 13, 2021 (KB3178643)

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 1 for Microsoft Office 2013 installed on the computer.

Be aware that the update in the Microsoft Download Center applies to the Microsoft Installer (.msi)-based edition of Office 2013. It doesn’t apply to the Office 2013 Click-to-Run editions, such as Microsoft Office 365 Home (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.

• Download security update 3178643 for the 32-bit version of Office 2013
• Download security update 3178643 for the 64-bit version of Office 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 doesn’t replace any previously released security update.

File hash information

File name	SHA1 hash	SHA256 hash
eurotool2013-kb3178643-fullfile-x86-glb.exe	B01F4EF81FF498982CC74D0A04583A11AF8399F3	758D40906853748C2A623100244F6F2948E7A7534C2B16076541F0B1CB413260
eurotool2013-kb3178643-fullfile-x64-glb.exe	EA8ACD63FC1815AAADA4DCD37C1682E04F3B4250	AAD02F87673CA628C817F1BB097BE9806F9206C3BE71943566C0E3691CE1362F

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.

__

For all supported x86-based versions of Office 2013

File identifier	File name	File version	File size	Date	Time
eurotool.xlam	eurotool.xlam		387865	17-Mar-21	06:38
msoeuro.dll	msoeuro.dll	15.0.5337.1000	29064	17-Mar-21	06:39

__

For all supported x64-based versions of Office 2013

File identifier	File name	File version	File size	Date	Time
eurotool.xlam	eurotool.xlam		399443	17-Mar-21	06:38
msoeuro.dll	msoeuro.dll	15.0.5337.1000	34712	17-Mar-21	06:39

Information about protection and security

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