https://wccftech.com/out-of-band-windows-update-is-out-to-fix-windows-server-issues/

Just days before this month's Patch Tuesday updates, Microsoft has released out-of-band (OOB) patches to address some Windows Server issues. These include a black screen, slow sign-in, and general slowness problems on Windows Server 2019 and Windows Server 2012 R2.

"After you install the December 14, 2021 Windows update on a server that is running Windows Server 2012 R2, the server may stop responding," the Windows maker explained. "Additionally, you may experience a black screen, slow sign in, or general slowness over time eventually causing the server to stop responding." The company has released KB5010196 for Windows Server 2019 and KB5010215 for Windows Server 2012 R2.