Exchange 2013 /2016 / 2019 Securitypatch May 2022 KB5014261 with AD prep

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There are some news about security patches for exchange systems around the world. As every time these patches are urgent ;-), but patching is not the only thing you have to do.
IMPORTANT: after installing SU you need to execute an additional AD prep
See the original post from exchange team

But before here is the link to CVE of Exchange SU.

As FAQs say, vulnerability can only be used if there is a highly priviliged user. So protect them!

Here is a short diagramm for all update paths.

  • Exchange Server 2013 CU23
  • Exchange Server 2016 CU22 and CU23
  • Exchange Server 2019 CU11 and CU12

NOTE: Exchange Services will be interrupted during update process

AD Prep after installing SUs

Execting an AD prep you need to access exchange install path with an administrative console. Administrative in this case means a user with Enterprise Admin rights

Default Exchange install path is:

C:\Program Files\Microsoft\Exchange Server\V15\Bin

AD Prep commands:

Setup.exe /IAcceptExchangeServerLicenseTerms_DiagnosticDataOFF /PrepareAllDomains
Setup.exe /IAcceptExchangeServerLicenseTerms /PrepareAllDomains

After installing the patch and executing AD prep just run the ExchangeHealthChecker to see if everything is fine.

Have fun updating yout exchange system and if you liked this article, please click in helpful.

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