Applies to:

Microsoft .NET Framework 4.8

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 on January 14, 2020. For more information on 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.

IMPORTANT Starting in August, 2019, updates to .NET Framework 4.6 and above, for Windows Server 2008 R2 SP1, and Windows 7SP1, require SHA-2 Code signing support. Please make sure that you have all the latest Windows Updates before applying this update to avoid installation issues. For more detailed information about SHA-2 code signing support updates, please see KB 4474419.

Summary

Security improvements

ClickOnce will no longer download applications from untrusted servers which use NTLM authentication, but, instead, will fail with “Authentication failed”. Sites in the Local Intranet and Trusted sites zones will continue to authenticate as before.

Quality and reliability improvements

CLR1

- Addresses an issue in some 32 bit apps where, in certain scenarios, the JIT might omit a function call

- Improved support for cleaning up private temporary certificate keys

WPF2

- Addresses an issue with a null-reference crash in automation code, arising from re-entrancy when reconnection to a remote desktop.


1 Common Language Runtime (CLR)
2 Windows Presentation Foundation (WPF)

Known issues in this update

Symptom

This update does not install, and it returns either or both of the following error messages:

  • -2146762495

  • A required certificate is not within its validity period when verifying against the current system clock or the timestamp in the signed file.

Workaround

This issue has been corrected in the latest Security and Quality Rollup for .NET Framework. 

Additional information about this update

The following articles contain additional information about this update as it relates to individual product versions.

  • 4576628 Description of the Security and Quality Rollup for .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows 7 SP1 and Windows Server 2008 R2 SP1 (KB4576628)

How to obtain and install the update

Before installing this update

Prerequisite:

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

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. The Extended Security Updates (ESU) Licensing Preparation Package (KB4538483) released February 11, 2020. 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.

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

Classification: Security Updates

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.

Update deployment information

For deployment details for this security update, go to the following article in the Microsoft Knowledge Base:

20200908 Security update deployment information: September 8, 2020

Update removal information

Note We do not recommend that you remove any security update. To remove this update, use the Programs and Features item in Control Panel.

Update restart information

This update does not require a system restart after you apply it unless files that are being updated are locked or are being used.

Update replacement information

This update replaces previously released updates 4570506.

File information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables.

x86

File name

File version

File size

Date

Time

Aspnet_perf.dll

4.8.4210.0

36,224

31-Jul-2020

01:06

aspnet_wp.exe

4.8.4210.0

39,816

31-Jul-2020

01:06

clr.dll

4.8.4240.0

8,037,768

31-Jul-2020

01:11

clrjit.dll

4.8.4240.0

554,888

31-Jul-2020

01:11

dfdll.dll

4.8.4240.0

178,056

31-Jul-2020

01:11

mscordacwks.dll

4.8.4240.0

1,307,520

31-Jul-2020

01:11

mscordbi.dll

4.8.4240.0

1,188,744

31-Jul-2020

01:11

mscoreei.dll

4.8.4180.0

581,920

31-Jul-2020

01:06

mscorlib.dll

4.8.4240.0

5,670,792

31-Jul-2020

01:11

Placeholder.dll

4.8.4240.0

18,312

31-Jul-2020

01:11

VsVersion.dll

14.8.4240.0

11,656

31-Jul-2020

01:11

PenIMC2_v0400.dll

4.8.4240.0

99,712

31-Jul-2020

01:11

peverify.dll

4.8.4240.0

182,656

31-Jul-2020

01:11

PresentationCore.dll

4.8.4240.0

3,671,432

31-Jul-2020

01:11

PresentationFramework.dll

4.8.4240.0

6,269,832

31-Jul-2020

01:06

PresentationFramework-SystemData.dll

4.8.4240.0

17,800

31-Jul-2020

01:06

PresentationHost_v0400.dll

4.8.4240.0

233,848

31-Jul-2020

01:11

PresentationHost_v0400.dll.mui

4.8.4240.0

77,704

31-Jul-2020

01:11

PresentationNative_v0400.dll

4.8.4240.0

923,000

31-Jul-2020

01:11

ReachFramework.dll

4.8.4110.0

677,656

31-Jul-2020

01:06

ServiceMonikerSupport.dll

4.8.4210.0

24,448

31-Jul-2020

01:06

SMDiagnostics.dll

4.8.4210.0

66,312

31-Jul-2020

01:06

SOS.dll

4.8.4240.0

767,368

31-Jul-2020

01:11

System.Speech.dll

4.8.4210.0

676,736

31-Jul-2020

01:06

System.Activities.dll

4.8.4210.0

1,526,536

31-Jul-2020

01:06

System.Activities.Presentation.dll

4.8.4180.0

2,127,136

31-Jul-2020

01:06

System.Core.dll

4.8.4240.0

1,549,080

31-Jul-2020

01:06

System.IdentityModel.dll

4.8.4210.0

1,086,720

31-Jul-2020

01:06

System.IdentityModel.Services.dll

4.8.4210.0

191,352

31-Jul-2020

01:06

System.Printing.dll

4.8.4110.0

399,640

31-Jul-2020

01:06

System.Runtime.Serialization.dll

4.8.4210.0

1,047,296

31-Jul-2020

01:06

System.ServiceModel.Channels.dll

4.8.4210.0

150,920

31-Jul-2020

01:06

System.ServiceModel.Discovery.dll

4.8.4210.0

301,448

31-Jul-2020

01:06

System.ServiceModel.dll

4.8.4210.0

6,381,832

31-Jul-2020

01:06

System.ServiceModel.Internals.dll

4.8.4210.0

246,536

31-Jul-2020

01:06

System.ServiceModel.WasHosting.dll

4.8.4210.0

33,160

31-Jul-2020

01:06

System.Web.ApplicationServices.dll

4.8.4210.0

63,752

31-Jul-2020

01:06

System.Web.Extensions.dll

4.8.4210.0

1,842,440

31-Jul-2020

01:06

System.Windows.Forms.DataVisualization.dll

4.8.4210.0

1,712,512

31-Jul-2020

01:06

System.Workflow.Activities.dll

4.8.4110.0

1,051,112

31-Jul-2020

01:06

System.Workflow.ComponentModel.dll

4.8.4110.0

1,557,272

31-Jul-2020

01:06

System.Workflow.Runtime.dll

4.8.4110.0

503,064

31-Jul-2020

01:06

System.Configuration.dll

4.8.4190.0

421,536

31-Jul-2020

01:06

System.Data.dll

4.8.4210.0

3,475,320

31-Jul-2020

01:06

System.Deployment.dll

4.8.4240.0

1,595,136

31-Jul-2020

01:06

System.dll

4.8.4210.0

3,552,520

31-Jul-2020

01:06

System.Drawing.Design.dll

4.8.4210.0

125,192

31-Jul-2020

01:06

System.Web.dll

4.8.4210.0

5,409,152

31-Jul-2020

01:06

System.Windows.Controls.Ribbon.dll

4.8.4240.0

743,816

31-Jul-2020

01:06

System.Windows.Forms.dll

4.8.4210.0

5,915,912

31-Jul-2020

01:06

System.Xaml.dll

4.8.4240.0

632,088

31-Jul-2020

01:06

UIAutomationClient.dll

4.8.4240.0

170,888

31-Jul-2020

01:06

UIAutomationClientsideProviders.dll

4.8.4240.0

354,184

31-Jul-2020

01:06

UIAutomationProvider.dll

4.8.4240.0

41,864

31-Jul-2020

01:06

UIAutomationTypes.dll

4.8.4240.0

215,944

31-Jul-2020

01:06

webengine.dll

4.8.4210.0

19,320

31-Jul-2020

01:06

webengine4.dll

4.8.4210.0

564,616

31-Jul-2020

01:06

WindowsBase.dll

4.8.4240.0

1,298,816

31-Jul-2020

01:06

WindowsFormsIntegration.dll

4.8.4180.0

105,248

31-Jul-2020

01:06

WorkflowServiceHostPerformanceCounters.dll

4.8.4110.0

89,368

31-Jul-2020

01:06

WPFFontCache_v0400.exe.mui

4.8.4240.0

12,160

31-Jul-2020

01:28

WPFFontCache_v0400.exe

4.8.4240.0

19,872

31-Jul-2020

01:28

wpfgfx_v0400.dll

4.8.4240.0

1,618,824

31-Jul-2020

01:11

x64

File name

File version

File size

Date

Time

Aspnet_perf.dll

4.8.4210.0

41,864

31-Jul-2020

01:06

Aspnet_perf.dll

4.8.4210.0

36,224

31-Jul-2020

01:06

aspnet_wp.exe

4.8.4210.0

45,448

31-Jul-2020

01:06

aspnet_wp.exe

4.8.4210.0

39,816

31-Jul-2020

01:06

clr.dll

4.8.4240.0

11,244,936

31-Jul-2020

01:06

clr.dll

4.8.4240.0

8,037,768

31-Jul-2020

01:11

clrjit.dll

4.8.4240.0

1,357,696

31-Jul-2020

01:06

clrjit.dll

4.8.4240.0

554,888

31-Jul-2020

01:11

compatjit.dll

4.8.4240.0

1,273,208

31-Jul-2020

01:06

dfdll.dll

4.8.4240.0

214,912

31-Jul-2020

01:06

dfdll.dll

4.8.4240.0

178,056

31-Jul-2020

01:11

mscordacwks.dll

4.8.4240.0

1,801,096

31-Jul-2020

01:06

mscordacwks.dll

4.8.4240.0

1,307,520

31-Jul-2020

01:11

mscordbi.dll

4.8.4240.0

1,655,168

31-Jul-2020

01:06

mscordbi.dll

4.8.4240.0

1,188,744

31-Jul-2020

01:11

mscoreei.dll

4.8.4180.0

689,952

31-Jul-2020

01:06

mscoreei.dll

4.8.4180.0

581,920

31-Jul-2020

01:06

mscorlib.dll

4.8.4240.0

5,431,688

31-Jul-2020

01:06

mscorlib.dll

4.8.4240.0

5,670,792

31-Jul-2020

01:11

VsVersion.dll

14.8.4240.0

11,656

31-Jul-2020

01:06

Placeholder.dll

4.8.4240.0

20,352

31-Jul-2020

01:06

Placeholder.dll

4.8.4240.0

18,312

31-Jul-2020

01:11

VsVersion.dll

14.8.4240.0

11,656

31-Jul-2020

01:11

PenIMC2_v0400.dll

4.8.4240.0

120,712

31-Jul-2020

01:06

PenIMC2_v0400.dll

4.8.4240.0

99,712

31-Jul-2020

01:11

peverify.dll

4.8.4240.0

265,600

31-Jul-2020

01:06

peverify.dll

4.8.4240.0

182,656

31-Jul-2020

01:11

PresentationCore.dll

4.8.4240.0

3,648,384

31-Jul-2020

01:06

PresentationCore.dll

4.8.4240.0

3,671,432

31-Jul-2020

01:11

PresentationFramework.dll

4.8.4240.0

6,269,832

31-Jul-2020

01:06

PresentationFramework-SystemData.dll

4.8.4240.0

17,800

31-Jul-2020

01:06

PresentationHost_v0400.dll

4.8.4240.0

302,464

31-Jul-2020

01:06

PresentationHost_v0400.dll.mui

4.8.4240.0

77,696

31-Jul-2020

01:06

PresentationHost_v0400.dll

4.8.4240.0

233,848

31-Jul-2020

01:11

PresentationHost_v0400.dll.mui

4.8.4240.0

77,704

31-Jul-2020

01:11

PresentationNative_v0400.dll

4.8.4240.0

1,164,168

31-Jul-2020

01:06

PresentationNative_v0400.dll

4.8.4240.0

923,000

31-Jul-2020

01:11

ReachFramework.dll

4.8.4110.0

677,656

31-Jul-2020

01:06

ServiceMonikerSupport.dll

4.8.4210.0

27,528

31-Jul-2020

01:06

ServiceMonikerSupport.dll

4.8.4210.0

24,448

31-Jul-2020

01:06

SMDiagnostics.dll

4.8.4210.0

66,312

31-Jul-2020

01:06

SOS.dll

4.8.4240.0

921,480

31-Jul-2020

01:06

SOS.dll

4.8.4240.0

767,368

31-Jul-2020

01:11

System.Speech.dll

4.8.4210.0

676,736

31-Jul-2020

01:06

System.Activities.dll

4.8.4210.0

1,526,536

31-Jul-2020

01:06

System.Activities.Presentation.dll

4.8.4180.0

2,127,136

31-Jul-2020

01:06

System.Core.dll

4.8.4240.0

1,549,080

31-Jul-2020

01:06

System.IdentityModel.dll

4.8.4210.0

1,086,720

31-Jul-2020

01:06

System.IdentityModel.Services.dll

4.8.4210.0

191,352

31-Jul-2020

01:06

System.Printing.dll

4.8.4110.0

400,152

31-Jul-2020

01:06

System.Printing.dll

4.8.4110.0

399,640

31-Jul-2020

01:06

System.Runtime.Serialization.dll

4.8.4210.0

1,047,296

31-Jul-2020

01:06

System.ServiceModel.Channels.dll

4.8.4210.0

150,920

31-Jul-2020

01:06

System.ServiceModel.Discovery.dll

4.8.4210.0

301,448

31-Jul-2020

01:06

System.ServiceModel.dll

4.8.4210.0

6,381,832

31-Jul-2020

01:06

System.ServiceModel.Internals.dll

4.8.4210.0

246,536

31-Jul-2020

01:06

System.ServiceModel.WasHosting.dll

4.8.4210.0

33,160

31-Jul-2020

01:06

System.Web.ApplicationServices.dll

4.8.4210.0

63,752

31-Jul-2020

01:06

System.Web.Extensions.dll

4.8.4210.0

1,842,440

31-Jul-2020

01:06

System.Windows.Forms.DataVisualization.dll

4.8.4210.0

1,712,512

31-Jul-2020

01:06

System.Workflow.Activities.dll

4.8.4110.0

1,051,112

31-Jul-2020

01:06

System.Workflow.ComponentModel.dll

4.8.4110.0

1,557,272

31-Jul-2020

01:06

System.Workflow.Runtime.dll

4.8.4110.0

503,064

31-Jul-2020

01:06

System.configuration.dll

4.8.4190.0

421,536

31-Jul-2020

01:06

System.Data.dll

4.8.4210.0

3,542,400

31-Jul-2020

01:06

System.Data.dll

4.8.4210.0

3,475,320

31-Jul-2020

01:06

System.Deployment.dll

4.8.4240.0

1,595,136

31-Jul-2020

01:06

System.dll

4.8.4210.0

3,552,520

31-Jul-2020

01:06

System.Drawing.Design.dll

4.8.4210.0

125,192

31-Jul-2020

01:06

System.Web.dll

4.8.4210.0

5,396,864

31-Jul-2020

01:06

System.Web.dll

4.8.4210.0

5,409,152

31-Jul-2020

01:06

System.Windows.Controls.Ribbon.dll

4.8.4240.0

743,816

31-Jul-2020

01:06

System.Windows.Forms.dll

4.8.4210.0

5,915,912

31-Jul-2020

01:06

System.Xaml.dll

4.8.4240.0

632,088

31-Jul-2020

01:06

UIAutomationClient.dll

4.8.4240.0

170,888

31-Jul-2020

01:06

UIAutomationClientsideProviders.dll

4.8.4240.0

354,184

31-Jul-2020

01:06

UIAutomationProvider.dll

4.8.4240.0

41,864

31-Jul-2020

01:06

UIAutomationTypes.dll

4.8.4240.0

215,944

31-Jul-2020

01:06

webengine.dll

4.8.4210.0

21,384

31-Jul-2020

01:06

webengine.dll

4.8.4210.0

19,320

31-Jul-2020

01:06

webengine4.dll

4.8.4210.0

675,200

31-Jul-2020

01:06

webengine4.dll

4.8.4210.0

564,616

31-Jul-2020

01:06

WindowsBase.dll

4.8.4240.0

1,298,816

31-Jul-2020

01:06

WindowsFormsIntegration.dll

4.8.4180.0

105,248

31-Jul-2020

01:06

WorkflowServiceHostPerformanceCounters.dll

4.8.4110.0

102,672

31-Jul-2020

01:06

WorkflowServiceHostPerformanceCounters.dll

4.8.4110.0

89,368

31-Jul-2020

01:06

WPFFontCache_v0400.exe.mui

4.8.4240.0

12,168

31-Jul-2020

01:28

WPFFontCache_v0400.exe.mui

4.8.4240.0

12,160

31-Jul-2020

01:28

WPFFontCache_v0400.exe

4.8.4240.0

21,920

31-Jul-2020

01:28

WPFFontCache_v0400.exe

4.8.4240.0

19,872

31-Jul-2020

01:28

wpfgfx_v0400.dll

4.8.4240.0

2,050,440

31-Jul-2020

01:06

wpfgfx_v0400.dll

4.8.4240.0

1,618,824

31-Jul-2020

01:11

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