IMPORTANT Release notes are changing! To learn about the new URL, metadata updates, and more, see What’s next for Windows release notes.
IMPORTANT Starting in July 2020, all Windows Updates will disable the RemoteFX vGPU feature because of a security vulnerability. For more information about the vulnerability, seeCVE-2020-1036 and KB4570006. After you install this update, attempts to start virtual machines (VM) that have RemoteFX vGPU enabled will fail, and messages such as the following will appear:If you re- enable RemoteFX vGPU, a message similar to the following will appear:
“The virtual machine cannot be started because the server has insufficient GPU resources.”
"We no longer support the RemoteFX 3D video adapter. If you are still using this adapter, you may become vulnerable to security risk. Learn more (https://go.microsoft.com/fwlink/?linkid=2131976)”
IMPORTANT Verify that you have installed the required updates listed in the How to get this update section before installing this update.
IMPORTANT Some customers who use Windows Server 2008 R2 SP1 and have activated their ESU multiple activation key (MAK) add-on before installing the January 14, 2020 updates might need to re-activate their key. Re-activation on the affected devices should only be required once. For information on activation, see this blog post.
IMPORTANT WSUS scan cab files will continue to be available for Windows 7 SP1 and Windows Server 2008 R2 SP1. If you have a subset of devices running these operating systems without ESU, they might show as non-compliant in your patch management and compliance toolsets.
IMPORTANT Customers who have purchased the Extended Security Update (ESU) for on-premises versions of these operating systems must follow the procedures in KB4522133 to continue receiving security updates after extended support ends. Extended support ends as follows:For more information about ESU and which editions are supported, see KB4497181.
IMPORTANT Starting on January 15, 2020, a full-screen notification will appear that describes the risk of continuing to use Windows 7 Service Pack 1 after it reaches end of support on January 14, 2020. The notification will remain on the screen until you interact with it. This notification will only appear on the following editions of Windows 7 Service Pack 1: Note The notification will not appear on domain-joined machines or machines in kiosk mode.
This security update includes improvements and fixes that were a part of update KB4577051 (released September 8, 2020) and addresses the following issues:
For more information about the resolved security vulnerabilities, please refer to the Security Update Guide.
After installing this update and restarting your device, you might receive the error, “Failure to configure Windows updates. Reverting Changes. Do not turn off your computer,” and the update might show as Failed in Update History.| This is expected in the following circumstances:
If you have purchased an ESU key and have encountered this issue, please
verify you have applied all prerequisites and that your key is activated. For
information on activation, please see this blog
post. For information on the prerequisites, see the "How to get this update"
section of this article.
Certain operations, such as rename , that you perform on files or folders that are on a Cluster Shared Volume (CSV) may fail with the error, “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs when you perform the operation on a CSV owner node from a process that doesn’t have administrator privilege.| Do one of the following:
Microsoft is working on a resolution and will provide an update in an upcoming release.
Before installing this update Prerequisite: You must install the updates listed below and restart your device before installing the latest Rollup. Installing these updates improves the reliability of the update process and mitigates potential issues while installing the Rollup and applying Microsoft security fixes.
After you install the items above, we strongly recommend that you install the
latest SSU (KB4580970). If you
are using Windows Update, the latest SSU will be offered to you automatically
if you are an ESU customer. To get the standalone package for the latest SSU,
search for it in the Microsoft Update
Catalog. For general
information about SSUs, see Servicing stack
updates and Servicing Stack Updates (SSU): Frequently Asked
Questions. Install this update
Release Channel| Available| Next Step
Windows Update and Microsoft Update| Yes| None. This update will be downloaded and installed automatically from Windows Update if you are an ESU customer.
Microsoft Update Catalog| Yes| To get the standalone package for this update, go to the Microsoft Update Catalog website.
Windows Server Update Services (WSUS)| Yes| This update will automatically sync with WSUS if you configure Products and Classifications as follows: Product : Windows 7 Service Pack 1, Windows Server 2008 R2 Service Pack 1, Windows Embedded Standard 7 Service Pack 1, Windows Embedded POSReady 7, Windows Thin PC Classification : Security Updates
File information For a list of the files that are provided in this update, download the file information for cumulative update 4580345.