Description of the security update for Word 2016: January 9, 2018

Applies to: Word 2016


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 the vulnerabilities, go to the following Common Vulnerabilities and Exposures (CVE).

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

Be aware that the update in the Microsoft Download Center applies to the Microsoft Installer (.msi)-based edition of Office 2016. It doesn't apply to the Office 2016 Click-to-Run editions, such as Microsoft Office 365 Home (see Determining your Office version).

Improvements and fixes

This security update contains improvements and fixes for the following nonsecurity issues:
  • In a Word 2016 document, when you right-click to select text and then drag it to another location, it does not work.
  • Word 2016 crashes after you open a document that contains ActiveX controls in an Active Document Container.

  • When you use Office add-in-rich APIs to delete the last paragraph in an Office document, the new last paragraph may take some format of the original last paragraph. After you install this update, the new last paragraph will keep its original format unchanged.
  • This update improves Office application startup performance by skipping unnecessary scanning of Microsoft Word documents that are local and not encrypted.

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: January 9, 2018.

Security update replacement information

This security update replaces previously released security update KB 4011575.

File hash information

Package Name Package Hash SHA 1 Package Hash SHA 2
word2016-kb4011643-fullfile-x64-glb.exe 1284374AA8CD3077130CB8D5AB292590B2623D36 B31ED7D9C07630D183DA8D3AED5FCEDAAF05D28E8BCAD428BA3505D636F2B6E5
word2016-kb4011643-fullfile-x86-glb.exe D21E8A81C95B0F6AFD8AE9CBFD41FB4C9266B6D4 2557CA2657421D96326930F657FD2FC21B4BCE88CC12509E3CCB12E7474AA3DF

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 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.

How to get help and support for this security update

Help for installing updates: Windows Update FAQ

Security solutions for IT professionals: 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