April 13, 2021—KB5001335 (Monthly Rollup)

Improvements and fixes

This security update includes improvements and fixes that were a part of update KB5000841 (released March 9, 2021) and addresses the following issues:

• Addresses a time zone change for Volgograd, Russia from UTC+4 to UTC+3 Moscow Standard Time (MSK).

• Addresses a time zone change for The Republic of South Sudan from UTC+3 to UTC+2 Juba. For more information about this change, see KB 4601275.

• Addresses an issue with security vulnerabilities identified by a security researcher. Because of these security vulnerabilities, this and all future Windows updates will no longer contain the RemoteFX vGPU feature. For more information about the vulnerability and its removal, see CVE-2020-1036 and KB4570006. Secure vGPU alternatives are available using Discrete Device Assignment (DDA) in Windows Server LTSC releases (Windows Server 2016 and Windows Server 2019) and Windows Server SAC releases (Windows Server, version 1803 and later versions).

• Addresses an issue that prevents you from specifying up to 255 columns when you use the Jet Text installable indexed sequential access method (IISAM) format.

• Addresses an issue if you monitor for these events, Windows Backup will not report a successful Event ID 14 or backup finished Event ID 4 after you apply update KB4561643 or KB4556843.

• Security updates to Windows Apps, Windows Hybrid Cloud Networking, Windows Kernel, and Windows Media.

For more information about the resolved security vulnerabilities, please refer to the new Security Update Guide website.

Known issues in this update

How to get this update

Before installing this update

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 Windows 7 Service Pack 1 and Windows Server 2008 R2 Service Pack 1, extended support ends on January 14, 2020.

• For Windows Embedded Standard 7, extended support ends on October 13, 2020.

For more information about ESU and which editions are supported, see KB4497181.

Note For Windows Embedded Standard 7, Windows Management Instrumentation (WMI) must be enabled to get updates from Windows Update or Windows Server Update Services.

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.

1. The March 12, 2019 servicing stack update (SSU) (KB4490628). To get the standalone package for this SSU, search for it in the Microsoft Update Catalog. This update is required to install updates that are only SHA-2 signed.

2. The latest SHA-2 update (KB4474419) released September 10, 2019. If you are using Windows Update, the latest SHA-2 update will be offered to you automatically. This update is required to install updates that are only SHA-2 signed. For more information on SHA-2 updates, see 2019 SHA-2 Code Signing Support requirement for Windows and WSUS.

3. For Windows Thin PC, you must have the August 11, 2020 SSU (KB4570673) or a later SSU installed to make sure you continue to get the extended security updates starting with the October 13, 2020 updates.

4. To get this security update, you must reinstall the "Extended Security Updates (ESU) Licensing Preparation Package" (KB4538483) or the "Update for the Extended Security Updates (ESU) Licensing Preparation Package" (KB4575903) even if you previously installed the ESU key. The ESU licensing preparation package will be offered to you from WSUS. To get the standalone package for ESU licensing preparation package, search for it in the Microsoft Update Catalog.

After you install the items above, we strongly recommend that you install the latest SSU (KB4592510). 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

File information

For a list of the files that are provided in this update, download the file information for cumulative update 5001335.