This security update resolves vulnerabilities when a Lync Server or Skype for Business Server does not properly sanitize a specially crafted request. To learn more about these vulnerabilities, see Microsoft Common Vulnerabilities and Exposures CVE-2019-1490.
Note To apply this security update, you must have the release version of Skype for Business 2019 CU 2 installed on the computer.
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.
Security update deployment information
For deployment information about this update, see security update deployment information: December 10, 2019.
Security update replacement information
This security update does not replace any previously released security update.
File hash information
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