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Release Date:
June 8, 2021

Version:
.NET Framework 4.8

The June 8, 2021 update for Windows 10, version 1607 and Windows Server, version 2016 includes cumulative reliability improvements in .NET Framework 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.

Quality and reliability improvements

WPF1

- Addresses an issue when rapid typing using an IME can crash via FailFast.

- Addresses an issue where Thaana characters displayed in left-to-right order.

- Addresses a crash when WebBrowser receives a completion event for a navigation it tried to cancel.

CLR2

- Addresses a performance issue caused by incorrect configuration in the GC.

- Addresses an issue where a background GC could pause the runtime for a long period of time if a large managed heap is filled with long lived objects with a deep chain of references.

- Addresses an issue where crashes could occur if security stackwalks were generated during ThreadAbortException handling.

NCL3

- .NET Framework 4.8 will now allow to negotiate TLS 1.3 if underlying OS supports it.

1 Windows Presentation Foundation (WPF)
2 Common Language Runtime (CLR)
3Network Class Library (NCL)

How to get this update

Install this update

Release Channel

Available

Next Step

Windows Update and Microsoft Update

Yes

To download and install this update, go to Settings > Update & Security > Windows Update, and then select Check for updates.

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 10, version 1607 and Windows Server, version 2016

Classification: Updates

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 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.

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