Windows Update KB5004331 Cumulative Update .NET Framework 3.5 and 4.8 for Windows 10 - August 10

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August 10, 2021 - KB5004331 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, and Windows Server, version 20H2, and Windows Version 21H1

The August 10, 2021 update for Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, and Windows Server, version 20H2, and Windows Version 21H1 includes cumulative reliability improvements in .NET Framework 3.5 and 4.8. We recommend that you apply this update as part of your regular maintenance routines. Before you install this update, see the Prerequisites and Restart requirement sections.

Summary

Security improvements

There are no new security improvements in this release. This update is cumulative and contains all previously released security improvements.

Quality and reliability improvements

CLR- In scenarios with both high numbers of assemblies and high numbers of GC heaps, Server GC can encounter serious lock contention during generation 2 GCs. A config switch has been introduced as a workaround. It can either be enabled from a .config file:

<configuration>
<runtime>
<GCStaticsNoLock enabled="true"/>
</runtime>
</configuration>

Or by setting environment variable COMPLUS_GCStaticsNoLockto a non-zero value. If the config switch is not enabled, behavior is unchanged compared to previous versions.
Winforms- Addresses an issue where some Windows Forms applications that use ToolStrip controls with ToolStripControlHost, and run under UIA Accessibility Tools, could make Accessibility Tools unresponsive.
- Addresses a regression in the ComboBox item accessible object where Accessibility Tools was not able to distinguish between identical items in the ComboBox and was becoming unresponsive.
1 Common Language Runtime (CLR)

How to get this update

Install this update

Release ChannelAvailableNext Step
Windows Update and Microsoft UpdateYesTo download and install this update, go to Settings > Update & Security > Windows Update, and then select Check for updates.
Microsoft Update CatalogYesTo get the standalone package for this update, go to the Microsoft Update Catalog website.
Windows Server Update Services (WSUS)NoYou can import this update into WSUS manually. See the Microsoft Update Catalog for instructions.
File information

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

Prerequisites

To apply this update, you must have .NET Framework 3.5 or 4.8 installed.

Restart requirement

You must restart the computer after you apply this update if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this update.

How to obtain help and support for this update
Known issues in this update

Microsoft is not currently aware of any issues in this update.


Source: July 29, 2021-KB5004331 Cumulative Update Preview for .NET Framework 3.5 and 4.8 for Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, and Windows Server, version 20H2, and Windows Version 21H1

See also: .NET Framework July 2021 Cumulative Update Preview


Direct download links for KB5004331 MSU file from Microsoft Update Catalog:

Download KB5004331 MSU for Windows 10 v2004, v20H2, and v21H1 32-bit (x86) - 41.8 MB

Download KB5004331 MSU for Windows 10 v2004, v20H2, and v21H1 64-bit (x64) - 65.4 MB

Download KB5004331 MSU for Windows 10 v2004, v20H2, and v21H1 ARM64 - 41.8 MB
 

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Brink

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KB5004331.jpg
 

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Brink

Administrator
Staff member
MVP
Local time
8:38 PM
Posts
2,326
Thread starter
KB5004331 no longer a preview update August 10, 2021. :)
 

My Computer

System One

  • Operating System
    Windows 10 Pro for Workstations
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom self build
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G7 27"
    Hard Drives
    1TB Samsung 980 PRO M.2,
    1TB Samsung 970 EVO Plus M.2,
    6TB WD Black WD6001FZWX
    8TB WD MyCloudEX2Ultra NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3 wall mounted
    Cooling
    Corsair Hydro H115i
    Keyboard
    Logitech wireless K800
    Mouse
    Logitech MX Master 3
    Internet Speed
    1 Gbps Download and 35 Mbps Upload
    Browser
    Google Chrome
    Antivirus
    Microsoft Defender and Malwarebytes Premium
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Galaxy S20 Ultra 5G phone
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