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May 2023 Cumulative Update Explained

hewagen's avatar
hewagen
Icon for Microsoft rankMicrosoft
Jul 05, 2023
Hi all,   Mitigating the Secure Boot UEFI bootkit using the May 2023 cumulative update still causes misunderstandings at some of my customers.  So I wrote this short article to give you an overvi...
Updated Jul 05, 2023
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HelmutWagensonner
KSE-LP's avatar
KSE-LP
Copper Contributor
Jul 12, 2023

Hi,

 

I've been applying this update on Windows 10 systems and some servers and it works fine. Except now when I use my WDS server to deploy a Windows 10 machine that has this patch applied, the WDS server shows me error 272 (0xc000000272 if I remember correctly).

 

I've previously downloaded a new ISO for Windows 10 the May 2023 release and this morning the June 2023 release and updated my boot image on WDS on both occasions, the same error. I've exported that boot image and updated it with a dynamic cumulative update for July 2023 and that doesn't work either.

 

If I turn off Secure Boot on the system, I can deploy it fine with WDS afterwards, which is logical, since its turned off.

 

Any ideas? I thought you just needed new ISO's to get a supported Boot image to work with this update.