Microsoft released KB5003214, the monthly “C” release preview cumulative update with non-security improvements and fixes for Windows 10 Versions 21H1, 2004 and 20H2. The Release Notes include a long list of improvements and fixes. The highlighted changes include the following:
Prerequisite:
You must install the May 11, 2021 update (KB5003173) before installing the latest cumulative update (LCU).
Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest LCU. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
If you are using Windows Update, the latest SSU will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.
For information about the the types of updates released by Microsoft each month see Windows 10 update servicing cadence primer.
Update: To get the update, go to Settings > Update & Security > Windows Update. The link to download and install the update can be found in the Optional updates available area.
Microsoft released KB5003212, the monthly “C” release preview cumulative update with non-security improvements and fixes for Windows 10 Version 1909. The Release Notes include a long list of improvements and fixes.
In addition, please note the important reminder from the KB5003212 Release Notes:
"REMINDER Windows 10, version 1909 reached end of service on May 11, 2021 for devices running the Home, Pro, Pro for Workstation, Nano Container, and Server SAC editions. After May 11, 2021, these devices will no longer receive monthly security and quality updates that contain protection from the latest security threats. To continue receiving security and quality updates, Microsoft recommends updating to the latest version of Windows 10
We will continue to service the following editions: Enterprise, Education, and IoT Enterprise."
Prerequisite:
You must install the April 13, 2021 servicing stack update (SSU) (KB5001406) or the latest SSU (KB5003244) before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
If you are using Windows Update, the latest SSU will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.
For information about the the types of updates released by Microsoft each month see Windows 10 update servicing cadence primer.
Note: This retirement does not affect in-market Windows 10 LTSC or Server Internet Explorer 11 desktop applications. It also does not affect the MSHTML (Trident) engine. For a full list of what is in scope for this announcement, and for other technical questions, please see our FAQ.
The Windows 10 version 21H1 release has begun!
Initially what is described as a "measured seeker-basked approach" to the rollout is being used. Microsoft is throttling availability to ensure a reliable experience. Also, as there might be a compatibility issue with a safeguard hold in place, those devices will not be offered the update.
Although it is advisable to check the Known issues first, if you are anxious to move to this new version, click on the Start Menu > Settings > Update & Security and click the "Check for update" button. Also see this article on How to get the Windows 10 May 2021 Update2020 Update, With an older device, you may want to wait until it is offered. As always, before making changes to your PC, make a backup.
Bleeping Computer has provide information about some of the changes included in this latest version at Windows 10 21H1 is released, these are the new features.
Reader DC and Acrobat DC were updated to version 21.001.20155. Updates should become available via the internal updater or checks can be manually activated by choosing Help/Check for Updates. Reader DC and other versions are available here: https://get.adobe.com/reader/
Note: UNcheck any pre-checked additional options presented with the update. They are not part of the software update and are completely optional.
The Microsoft May 2021 security updates have been released and consist of 55 CVEs. Of these 55 CVEs, 4 are rated Critical, 50 Important, and 1 is rated Moderate in severity.
According to Microsoft, although three of the bugs are listed as being publicly known, none are listed as currently being exploited.
The updates apply to the following products: .NET Core & Visual Studio, HTTP.sys, Internet Explorer, Microsoft Accessibility Insights for Webk, Microsoft Bluetooth Driver, Microsoft Dynamics Finance & Operations, Microsoft Exchange Server, Microsoft Graphics Component, Microsoft Office, Microsoft Office Access, Microsoft Office Excel, Microsoft Office SharePoint, Microsoft Office Word, Microsoft Windows Codecs Library, Microsoft Windows IrDA, Open Source Software, Role: Hyper-V, Skype for Business and Microsoft Lync, Visual Studio, Visual Studio Code, Windows Container , Isolation FS Filter Driver, Windows Container Manager Service, Windows Cryptographic Services, Windows CSC Service, Windows Desktop Bridge, Windows OLE, Windows Projected File System FS Filter, Windows RDP Client, Windows SMB, Windows SSDP Service, Windows WalletService, and Windows Wireless Networking.
Microsoft now combines the
latest servicing stack update (SSU) for your operating system with the latest
cumulative update (LCU). For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
For Windows 10 Version 1909, see KB5003209.
The KBs listed below contain information about known issues with the security updates:
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KB Article |
Applies To |
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Windows 10, Version 1909, Windows Server, Version 1909 |
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Windows 10, Version 1809, Windows Server 2019 |
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Windows 10, Version 2004, Windows Server, Version 2004, Windows 10, Version 20H2, Windows Server, Version 20H2 |
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Windows 10, Version 1607, Windows Server 2016 |
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Windows Server 2012 (Security-only update) |
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Windows Server 2012 (Monthly Rollup) |
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Windows 8.1, Windows Server 2012 R2 (Monthly Rollup) |
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Windows Server 2008 SP2 (Monthly Rollup) |
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Windows 8.1 Windows Server 2012 R2 (Security-only update) |
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Windows Server 2008 SP2 (Security-only update) |
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Windows 7 SP2, Windows Server 2008 R2 (Security-only update) |
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Windows 7 SP2, Windows Server 2008 R2 (Monthly Rollup) |
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Exchange Server 2019, 2016, and 2013 |
Recommended Reading: See Dustin Childs review and analysis in Zero Day Initiative -- The May 2021 Security Update Review.
Additional Update Notes:
References
Mozilla sent Firefox Version 88.0.1 to the release channel today. The update includes two security updates of which one (1) is rated critical and one (1) is rated high.
In addition, Firefox ESR was updated to Version 78.10.1 with one (1) security update, rated moderate:
#CVE-2021-29951: Mozilla Maintenance Service could have been started or stopped by domain users
Critical
High
Fixed