This security update resolves a denial of service vulnerability in Microsoft Skype for Business Server and Microsoft Lync Server. To learn more about these vulnerabilities, see Microsoft Common Vulnerabilities and Exposures CVE-2021-24099.
Note To apply this security update, you must have the release version of the following products installed:
Microsoft Skype for Business Server 2019 CU2
Microsoft Skype for Business Server 2015 CU 8
Microsoft Lync Server 2013
How to get and install the update
To get this update, install the following updates:
Security update deployment information
For deployment information about this update, see security update deployment information: February 9, 2021.
How to get help and support for this security update
Protect yourself online: Windows Security support
Learn how we guard against cyber threats: Microsoft Security