Summary

This security update resolves vulnerabilities in Microsoft Office that could allow remote code execution if a user opens a specially crafted Office file. To learn more about these vulnerabilities, see Microsoft Common Vulnerabilities and Exposures CVE-2017-8509.

Note To apply this security update, you must have the release version of Office 2016 installed on the computer.

Improvements and fixes

This security update contains improvements and fixes for the following nonsecurity issue:

  • Increases the number of retries when trying to connect to a host in Microsoft Outlook 2016. By default, WinHTTP will try six IP addresses (one initial attempt and five retries) when trying to establish a connection to a host. If Outlook 2016 tries more than six IP addresses, the connection will fail. This is particularly problematic on networks that have intermittent IPv6 connectivity problems. Increasing the number of retries may allow the connection to succeed with IPv4 addresses. To enable this feature, see KB3178716 for more information.

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 stand-alone package for this update, go to the Microsoft Update Catalog website.

Method 3: Microsoft Download Center

You can get the stand-alone 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: June 13, 2017.

Security update replacement information

This security update does not replace any previously released update.

File hash information

Package Name

Package Hash SHA 1

Package Hash SHA 2

msodll202016-kb3178667-fullfile-x86-glb.exe

DA58D21C6030CFD0BA0F56FAAC82D858757B8016

1C880ADC98566C6275B441AF335B908912DF0390136B081F587502AD7E41389B

msodll202016-kb3178667-fullfile-x64-glb.exe

6AD49BC174A182F8317142FA6045D6B729FDC46A

FB020808A6333588EA86AE01C54F0E13AE938B600FC452CC4BD3314B896BBAED

File information

The English version of this security update has the file attributes (or later file attributes) that are listed in the following table. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the 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 the times may change when you perform certain operations on the files.

For all supported x86-based versions of Office 2016

File identifier

File name

File version

File size

Date

Time

mso20win32client.dll

mso20win32client.dll

16.0.4549.1000

3161856

mso20win32client.dll.x64

mso20win32client.dll

16.0.4549.1000

3161856

17-May-17

03:19

mso20win32client.dll.x86

mso20win32client.dll

16.0.4549.1000

1923328

17-May-17

03:19

For all supported x64-based versions of Office 2016

File identifier

File name

File version

File size

Date

Time

mso20win32client.dll

mso20win32client.dll

16.0.4549.1000

3161856

mso20win32client.dll.x64

mso20win32client.dll

16.0.4549.1000

3161856

17-May-17

03:19

mso20win32client.dll.x86

mso20win32client.dll

16.0.4549.1000

1923328

17-May-17

03:19

How to get help and support for this security update

Help for installing updates: Windows Update FAQ

Security solutions for IT professionals: TechNet Security Support and Troubleshooting

Help for protecting your Windows-based computer from viruses and malware: Microsoft Secure

Local support according to your country: International Support

Propose a feature or provide feedback on Office Core: Office User Voice portal

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