Windows buggy patch breaks Microsoft Defender for Endpoint • The Register


A sad-faced Microsoft engineer had to reset the “Days since last shot in the foot” counter at company headquarters after a security update snapped Microsoft Defender for Endpoint on Windows Server Core.

The problem started with the fixes released on November 9, KB5007205 and KB5007206. The latter included LTSC editions of Windows 10, however, as Microsoft pointed out, only devices with a Windows Server Core installation were affected. Microsoft Defender for Endpoint on Windows 10 will therefore still behave normally.

It seems even Microsoft’s latest and greatest isn’t immune to the company’s inability to release fixes that don’t break something or the other. KB5007205 is for Windows Server 2022 and the later preview fix released earlier this week, KB5007254, has the same issue.

That said, the preview patch fixes the Windows Installer issue that broke Kaspersky’s products for some users (as did KB5007266 for Server 2019. The Defender for Endpoint issues remained however.

As to how the issue manifests itself, Microsoft Defender for Endpoint may just not start or run on affected systems (again, just Server, not Windows 10.) This is not ideal, because the purpose of the platform is to prevent, detect and respond to threats.

It uses, according to Microsoft, the technology built into its “robust cloud service”.

It is therefore unfortunate that its own quality processes seem a little less robust, as implied by the increase in known issues.

For now, there is no solution to the problem or an estimated date for its arrival. Microsoft said, “We are working on a resolution and will provide an update in a future release,” so all is well.

The register contacted Microsoft for details, who said they had “nothing else to share at this time.” ®

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