Description of the security update for Office Online Server: November 28, 2017


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 ADV170020.

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

How to get and install the update

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: November 14, 2017.

Security update replacement information

This security update replaces the previously released update 3213659.

File hash information

Package name Package hash SHA 1 Package hash SHA 2
wacserver2016-kb4011020-fullfile-x64-glb.exe 384E237A4B89E82FF79F15F44A04985F1AF571BC 839B0FC7DD3435D317F7A21B061034D3A07672E765B28140DE8A55B9250B9EDE

File information

For the list of files that cumulative update 4011020 contains, download the file information for update 4011020.

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