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-2018-0792 and Microsoft Common Vulnerabilities and Exposures CVE-2018-0797.
Note To apply this security update, you must have the release version of Office Online Server installed on the computer.
Microsoft is aware of an issue that may cause the installation of this update to fail. This issue is resolved in security update 4011022. For more information, go to the following article in the Microsoft Knowledge Base:
How to get and install the update
Method 1: Microsoft Update Catalog
To get the stand-alone package for this update, go to the Microsoft Update Catalog website.
Method 2: 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.
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 4011020.
File hash information
|Package Name||Package Hash SHA 1||Package Hash SHA 2|
For the list of files that cumulative update 4011021 contains, download the file information.
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 SharePoint: SharePoint User Voice portal