SfB 2015 Server Security Update – May 2021

This security update for SfBS 2015 (addressing a spoofing vulnerability) is build 6.0.9319.606, up from February’s security update version 6.0.9319.601. It updated only two components on my Standard Edition Front-End.

What’s Fixed?

This security update resolves vulnerabilities in Microsoft Skype for Business Server and Microsoft Lync Server. To learn more about these vulnerabilities, see Microsoft Common Vulnerabilities and Exposures CVE-2021-26422 and Microsoft Common Vulnerabilities and Exposures CVE-2021-26421.

What’s New?

Nothing noted. No cmdlets have been added to the SfB module in this update.

What’s Changed?

Nothing noted.



Here’s the “before” view of it going on to my Lab’s Standard Edition Front-End:


The installer didn’t prompt me to reboot, but I always like to give it one for good measure.

Revision History

30th May 2021: This is the initial release.
– G.

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