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Feb 2021 Skype for Business Server 2015, 2019 and Lync Server 2013 Denial of Service Security Patch

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Thought this was worth a post to get the word out. There is an important update for Skype for Business Server 2015, 2019 and Lync Server 2013 to protect against

CVE-2021-24099, Skype for Business and Lync Denial of Service Vulnerability

The exploit was privately disclosed to Microsoft by Markus Wulftange of Code White GmbH and has not yet been seen in the wild. If exploited, it can cause a total loss of server availability for users.

You can grab the patch here:

Description of the security update for Skype for Business Server and Lync Server: February 9, 2021 (KB5000675) (microsoft.com)

 

Thanks, Tobie Fysh for flagging this one.

Happy patching!

About the author

Tom Arbuthnot

A Microsoft MVP and Microsoft Certified Master, Tom Arbuthnot is Principal Solutions Architect at Microsoft Collaboration specialists Modality Systems.

Tom stays up to date with industry developments and shares news and his opinions on his blog, Microsoft Teams Podcast and email list. He is a regular speaker at events around the world.

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Tom Talks Microsoft Teams and Microsoft 365 news and opinions