Applies to:

Microsoft .NET Framework 4.8

REMINDER Windows Server 2008 R2 SP1 have reached the end of mainstream support and are now in extended security update (ESU) support.

Starting in July 2020, there will no longer be optional, non-security releases (known as "C" releases) for this operating system. Operating systems in extended support have only cumulative monthly security updates (known as the "B" or Update Tuesday release).

Verify that you have installed the required updates listed in the How to get this update section before installing this update. 

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. For more information, see the ESU blog.

The April 9, 2024 update for Windows Server 2008 R2 SP1 includes cumulative security and reliability improvements in .NET Framework 4.8. We recommend that you apply this update as part of your regular maintenance routines. Verify that you have installed the required updates listed in the How to get this update section before installing this update.

Summary

Security Improvements

CVE-2024-21409 - .NET Framework Remote Code Execution Vulnerability This security update addresses a remote code execution vulnerability detailed in CVE-2024-21409.

.NET Framework Defense in Depth Vulnerability This security update addresses an issue where version of the OSS zlib library is out of date.

.NET Framework Defense in Depth Vulnerability This security update addresses an issue in AIA fetching process.

Quality and Reliability Improvements

ASP.NET

- Addresses an issue with JavaScriptSerializer where after installing the January Security and Quality update there is a performance degradation.

CLR1

- Addresses an issue with thread pool recycled lists become unresponsive on multi-CPU-group computers.

1Common Language Runtime (CLR)

Additional information about this update

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

  • 5037038 Description of the Security and Quality Rollup for .NET Framework 3.5.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Server 2008 R2 SP1 (KB5037038)

Known issues in this update

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

How to get this 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 or newer update. 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. To get this security update, you must reinstall the "Extended Security Updates (ESU) Licensing Preparation Package" (KB5016892) for Windows Server 2008 R2 SP1 that is dated August 8, 2022 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.

  4. After you install the items above, we strongly recommend that you install the latest SSU.

    For Windows Server 2008 R2 SP1, you must have the servicing stack update (SSU) (KB5017397) that is dated September 13, 2022 or later installed. For more information about the latest SSU updates, see ADV990001 | Latest Servicing Stack Updates. If you use 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.

  5. Download the ESU MAK add-on key from the VLSC portal and deploy and activate the ESU MAK add-on key. If you use the Volume Activation Management Tool  (VAMT) to deploy and activate keys, follow the instructions here.

    IMPORTANT You do not need an additional key for deployment of the following:

    • You do not need to deploy an additional ESU key for Azure virtual machines (VMs), Azure Stack HCI.

    • For other Azure products such as Azure VMWare, Azure Nutanix solution Azure Stack (Hub, Edge), or for bring-your-own images on Azure for Windows Server 2008 SP2, and Windows Server 2008 R2 SP1 you do need to deploy the ESU key.  The steps to install, activate, and deploy ESUs are the same for the fourth year of ESU coverage.

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 individual .NET Framework product update will be installed, as applicable, by applying the operating system update. For more information about operating system updates see additional information about this update section.

Restart requirement

You may need to 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, see the Deployments tab of the Microsoft Security Response Center (MSRC) Security Update Guide.

Update replacement information

This update replaces previously released updates KB5034277 and KB5034687.

File Information

x86

File name

File version

File size

Date

Time

Aspnet_perf.dll

4.8.4718.0

37,296

26-Mar-2024

04:52

aspnet_wp.exe

4.8.4718.0

41,000

26-Mar-2024

04:52

clr.dll

4.8.4718.0

8,659,496

26-Mar-2024

04:52

clrcompression.dll

4.8.4700.0

123,824

26-Mar-2024

05:38

clrjit.dll

4.8.4718.0

555,968

26-Mar-2024

04:52

dfdll.dll

4.8.4654.0

179,080

26-Mar-2024

05:38

diasymreader.dll

14.8.4667.0

1,079,232

26-Mar-2024

05:38

mscordacwks.dll

4.8.4718.0

1,308,576

26-Mar-2024

04:52

mscordbi.dll

4.8.4718.0

1,189,280

26-Mar-2024

04:52

mscoreei.dll

4.8.4180.0

581,920

26-Mar-2024

05:38

mscorlib.dll

4.8.4718.0

5,737,000

26-Mar-2024

04:52

mscorsvc.dll

4.8.4331.0

454,032

26-Mar-2024

05:38

mscorsvw.exe

4.8.4331.0

125,880

26-Mar-2024

05:38

ngen.exe

4.8.4331.0

144,360

26-Mar-2024

05:38

Placeholder.dll

4.8.4718.0

19,488

26-Mar-2024

04:28

VsVersion.dll

14.8.4718.0

12,736

26-Mar-2024

04:28

PenIMC2_v0400.dll

4.8.4718.0

100,800

26-Mar-2024

04:28

peverify.dll

4.8.4718.0

183,728

26-Mar-2024

04:52

PresentationCore.dll

4.8.4718.0

3,678,144

26-Mar-2024

04:28

PresentationFramework.dll

4.8.4718.0

6,294,976

26-Mar-2024

04:28

PresentationFramework-SystemData.dll

4.8.4718.0

18,992

26-Mar-2024

04:28

PresentationHost_v0400.dll

4.8.4718.0

234,944

26-Mar-2024

04:28

PresentationHost_v0400.dll.mui

4.8.4718.0

78,880

26-Mar-2024

04:28

PresentationNative_v0400.dll

4.8.4718.0

924,096

26-Mar-2024

04:28

ReachFramework.dll

4.8.4110.0

677,656

26-Mar-2024

05:38

ServiceMonikerSupport.dll

4.8.4718.0

25,536

26-Mar-2024

04:28

SMDiagnostics.dll

4.8.4718.0

68,608

26-Mar-2024

04:28

SOS.dll

4.8.4718.0

768,944

26-Mar-2024

04:52

System.Speech.dll

4.8.4210.0

676,736

26-Mar-2024

05:38

System.Activities.dll

4.8.4718.0

1,528,904

26-Mar-2024

04:28

System.Activities.Presentation.dll

4.8.4526.0

2,121,104

26-Mar-2024

05:38

System.Core.dll

4.8.4718.0

1,551,328

26-Mar-2024

04:21

System.IdentityModel.dll

4.8.4718.0

1,090,448

26-Mar-2024

04:28

System.IdentityModel.Services.dll

4.8.4718.0

192,536

26-Mar-2024

04:21

System.Printing.dll

4.8.4110.0

399,640

26-Mar-2024

05:38

System.Runtime.Serialization.dll

4.8.4718.0

1,049,672

26-Mar-2024

04:28

System.ServiceModel.Activities.dll

4.8.4261.0

555,384

26-Mar-2024

05:38

System.ServiceModel.Channels.dll

4.8.4718.0

152,096

26-Mar-2024

04:28

System.ServiceModel.Discovery.dll

4.8.4718.0

302,624

26-Mar-2024

04:28

System.ServiceModel.dll

4.8.4718.0

6,387,592

26-Mar-2024

04:28

System.ServiceModel.Internals.dll

4.8.4718.0

248,800

26-Mar-2024

04:28

System.ServiceModel.WasHosting.dll

4.8.4718.0

34,336

26-Mar-2024

04:28

System.ServiceModel.Web.dll

4.8.4261.0

321,792

26-Mar-2024

05:38

System.Web.ApplicationServices.dll

4.8.4718.0

66,120

26-Mar-2024

04:21

System.Web.Extensions.dll

4.8.4718.0

1,845,240

26-Mar-2024

04:21

System.Windows.Forms.DataVisualization.dll

4.8.4210.0

1,712,512

26-Mar-2024

05:38

System.Workflow.Activities.dll

4.8.4110.0

1,051,112

26-Mar-2024

05:38

System.Workflow.ComponentModel.dll

4.8.4110.0

1,557,272

26-Mar-2024

05:38

System.Workflow.Runtime.dll

4.8.4110.0

503,064

26-Mar-2024

05:38

System.Configuration.dll

4.8.4190.0

421,536

26-Mar-2024

05:38

System.Data.dll

4.8.4690.0

3,480,608

26-Mar-2024

05:38

System.Deployment.dll

4.8.4654.0

1,596,304

26-Mar-2024

05:38

System.DirectoryServices.dll

4.8.4510.0

418,112

26-Mar-2024

05:38

System.dll

4.8.4718.0

3,561,952

26-Mar-2024

04:21

System.Drawing.Design.dll

4.8.4210.0

125,192

26-Mar-2024

05:38

System.Drawing.dll

4.8.4395.0

595,728

26-Mar-2024

05:38

System.Management.dll

4.8.4450.0

408,856

26-Mar-2024

05:38

System.Runtime.Remoting.dll

4.8.4690.0

343,008

26-Mar-2024

05:38

System.Security.dll

4.8.4261.0

320,280

26-Mar-2024

05:38

System.Web.dll

4.8.4718.0

5,412,896

26-Mar-2024

04:52

System.Windows.Controls.Ribbon.dll

4.8.4718.0

744,992

26-Mar-2024

04:28

System.Windows.Forms.dll

4.8.4654.0

5,922,672

26-Mar-2024

05:38

System.Xaml.dll

4.8.4718.0

634,256

26-Mar-2024

04:28

UIAutomationClient.dll

4.8.4718.0

172,576

26-Mar-2024

04:28

UIAutomationClientsideProviders.dll

4.8.4718.0

355,360

26-Mar-2024

04:28

UIAutomationProvider.dll

4.8.4718.0

43,040

26-Mar-2024

04:28

UIAutomationTypes.dll

4.8.4718.0

217,136

26-Mar-2024

04:28

webengine.dll

4.8.4718.0

20,400

26-Mar-2024

04:52

webengine4.dll

4.8.4718.0

565,792

26-Mar-2024

04:52

WindowsBase.dll

4.8.4718.0

1,300,512

26-Mar-2024

04:28

WindowsFormsIntegration.dll

4.8.4614.0

102,336

26-Mar-2024

05:38

WorkflowServiceHostPerformanceCounters.dll

4.8.4110.0

89,368

26-Mar-2024

05:38

WPFFontCache_v0400.exe.mui

4.8.4718.0

13,248

26-Mar-2024

04:29

WPFFontCache_v0400.exe

4.8.4718.0

21,048

26-Mar-2024

04:29

wpfgfx_v0400.dll

4.8.4718.0

1,620,512

26-Mar-2024

04:28

x64

File name

File version

File size

Date

Time

Aspnet_perf.dll

4.8.4718.0

43,056

26-Mar-2024

04:21

Aspnet_perf.dll

4.8.4718.0

37,296

26-Mar-2024

04:52

aspnet_wp.exe

4.8.4718.0

46,520

26-Mar-2024

04:21

aspnet_wp.exe

4.8.4718.0

41,000

26-Mar-2024

04:52

clr.dll

4.8.4718.0

11,710,384

26-Mar-2024

04:21

clr.dll

4.8.4718.0

8,659,496

26-Mar-2024

04:52

clrcompression.dll

4.8.4700.0

141,856

26-Mar-2024

05:38

clrcompression.dll

4.8.4700.0

123,824

26-Mar-2024

05:38

clrjit.dll

4.8.4718.0

1,359,392

26-Mar-2024

04:21

clrjit.dll

4.8.4718.0

555,968

26-Mar-2024

04:52

compatjit.dll

4.8.4718.0

1,274,416

26-Mar-2024

04:21

dfdll.dll

4.8.4654.0

215,944

26-Mar-2024

05:38

dfdll.dll

4.8.4654.0

179,080

26-Mar-2024

05:38

diasymreader.dll

14.8.4667.0

1,494,920

26-Mar-2024

05:38

diasymreader.dll

14.8.4667.0

1,079,232

26-Mar-2024

05:38

mscordacwks.dll

4.8.4718.0

1,803,696

26-Mar-2024

04:21

mscordacwks.dll

4.8.4718.0

1,308,576

26-Mar-2024

04:52

mscordbi.dll

4.8.4718.0

1,655,728

26-Mar-2024

04:21

mscordbi.dll

4.8.4718.0

1,189,280

26-Mar-2024

04:52

mscoreei.dll

4.8.4180.0

689,952

26-Mar-2024

05:38

mscoreei.dll

4.8.4180.0

581,920

26-Mar-2024

05:38

mscorlib.dll

4.8.4718.0

5,499,312

26-Mar-2024

04:21

mscorlib.dll

4.8.4718.0

5,737,000

26-Mar-2024

04:52

mscorsvc.dll

4.8.4331.0

557,944

26-Mar-2024

05:38

mscorsvc.dll

4.8.4331.0

454,032

26-Mar-2024

05:38

mscorsvw.exe

4.8.4331.0

152,000

26-Mar-2024

05:38

mscorsvw.exe

4.8.4331.0

125,880

26-Mar-2024

05:38

ngen.exe

4.8.4331.0

174,568

26-Mar-2024

05:38

ngen.exe

4.8.4331.0

144,360

26-Mar-2024

05:38

VsVersion.dll

14.8.4718.0

12,720

26-Mar-2024

04:28

Placeholder.dll

4.8.4718.0

21,424

26-Mar-2024

04:28

Placeholder.dll

4.8.4718.0

19,488

26-Mar-2024

04:28

VsVersion.dll

14.8.4718.0

12,736

26-Mar-2024

04:28

PenIMC2_v0400.dll

4.8.4718.0

121,776

26-Mar-2024

04:28

PenIMC2_v0400.dll

4.8.4718.0

100,800

26-Mar-2024

04:28

peverify.dll

4.8.4718.0

266,688

26-Mar-2024

04:21

peverify.dll

4.8.4718.0

183,728

26-Mar-2024

04:52

PresentationCore.dll

4.8.4718.0

3,654,576

26-Mar-2024

04:28

PresentationCore.dll

4.8.4718.0

3,678,144

26-Mar-2024

04:28

PresentationFramework.dll

4.8.4718.0

6,294,976

26-Mar-2024

04:28

PresentationFramework-SystemData.dll

4.8.4718.0

18,992

26-Mar-2024

04:28

PresentationHost_v0400.dll

4.8.4718.0

303,536

26-Mar-2024

04:28

PresentationHost_v0400.dll.mui

4.8.4718.0

78,784

26-Mar-2024

04:28

PresentationHost_v0400.dll

4.8.4718.0

234,944

26-Mar-2024

04:28

PresentationHost_v0400.dll.mui

4.8.4718.0

78,880

26-Mar-2024

04:28

PresentationNative_v0400.dll

4.8.4718.0

1,165,344

26-Mar-2024

04:28

PresentationNative_v0400.dll

4.8.4718.0

924,096

26-Mar-2024

04:28

ReachFramework.dll

4.8.4110.0

677,656

26-Mar-2024

05:38

ServiceMonikerSupport.dll

4.8.4718.0

28,608

26-Mar-2024

04:28

ServiceMonikerSupport.dll

4.8.4718.0

25,536

26-Mar-2024

04:28

SMDiagnostics.dll

4.8.4718.0

68,608

26-Mar-2024

04:28

SOS.dll

4.8.4718.0

923,040

26-Mar-2024

04:21

SOS.dll

4.8.4718.0

768,944

26-Mar-2024

04:52

System.Speech.dll

4.8.4210.0

676,736

26-Mar-2024

05:38

System.Activities.dll

4.8.4718.0

1,528,904

26-Mar-2024

04:28

System.Activities.Presentation.dll

4.8.4526.0

2,121,104

26-Mar-2024

05:38

System.Core.dll

4.8.4718.0

1,551,328

26-Mar-2024

04:21

System.IdentityModel.dll

4.8.4718.0

1,090,448

26-Mar-2024

04:28

System.IdentityModel.Services.dll

4.8.4718.0

192,536

26-Mar-2024

04:21

System.Printing.dll

4.8.4110.0

400,152

26-Mar-2024

05:38

System.Printing.dll

4.8.4110.0

399,640

26-Mar-2024

05:38

System.Runtime.Serialization.dll

4.8.4718.0

1,049,672

26-Mar-2024

04:28

System.ServiceModel.Activities.dll

4.8.4261.0

555,384

26-Mar-2024

05:38

System.ServiceModel.Channels.dll

4.8.4718.0

152,096

26-Mar-2024

04:28

System.ServiceModel.Discovery.dll

4.8.4718.0

302,624

26-Mar-2024

04:28

System.ServiceModel.dll

4.8.4718.0

6,387,592

26-Mar-2024

04:28

System.ServiceModel.Internals.dll

4.8.4718.0

248,800

26-Mar-2024

04:28

System.ServiceModel.WasHosting.dll

4.8.4718.0

34,336

26-Mar-2024

04:28

System.ServiceModel.Web.dll

4.8.4261.0

321,792

26-Mar-2024

05:38

System.Web.ApplicationServices.dll

4.8.4718.0

66,120

26-Mar-2024

04:21

System.Web.Extensions.dll

4.8.4718.0

1,845,240

26-Mar-2024

04:21

System.Windows.Forms.DataVisualization.dll

4.8.4210.0

1,712,512

26-Mar-2024

05:38

System.Workflow.Activities.dll

4.8.4110.0

1,051,112

26-Mar-2024

05:38

System.Workflow.ComponentModel.dll

4.8.4110.0

1,557,272

26-Mar-2024

05:38

System.Workflow.Runtime.dll

4.8.4110.0

503,064

26-Mar-2024

05:38

System.configuration.dll

4.8.4190.0

421,536

26-Mar-2024

05:38

System.Data.dll

4.8.4690.0

3,547,168

26-Mar-2024

05:38

System.Data.dll

4.8.4690.0

3,480,608

26-Mar-2024

05:38

System.Deployment.dll

4.8.4654.0

1,596,304

26-Mar-2024

05:38

System.DirectoryServices.dll

4.8.4510.0

418,112

26-Mar-2024

05:38

System.dll

4.8.4718.0

3,561,952

26-Mar-2024

04:21

System.Drawing.Design.dll

4.8.4210.0

125,192

26-Mar-2024

05:38

System.Drawing.dll

4.8.4395.0

595,728

26-Mar-2024

05:38

System.Management.dll

4.8.4450.0

408,856

26-Mar-2024

05:38

System.Runtime.Remoting.dll

4.8.4690.0

343,008

26-Mar-2024

05:38

System.Security.dll

4.8.4261.0

320,280

26-Mar-2024

05:38

System.Web.dll

4.8.4718.0

5,400,496

26-Mar-2024

04:21

System.Web.dll

4.8.4718.0

5,412,896

26-Mar-2024

04:52

System.Windows.Controls.Ribbon.dll

4.8.4718.0

744,992

26-Mar-2024

04:28

System.Windows.Forms.dll

4.8.4654.0

5,922,672

26-Mar-2024

05:38

System.Xaml.dll

4.8.4718.0

634,256

26-Mar-2024

04:28

UIAutomationClient.dll

4.8.4718.0

172,576

26-Mar-2024

04:28

UIAutomationClientsideProviders.dll

4.8.4718.0

355,360

26-Mar-2024

04:28

UIAutomationProvider.dll

4.8.4718.0

43,040

26-Mar-2024

04:28

UIAutomationTypes.dll

4.8.4718.0

217,136

26-Mar-2024

04:28

webengine.dll

4.8.4718.0

22,448

26-Mar-2024

04:21

webengine.dll

4.8.4718.0

20,400

26-Mar-2024

04:52

webengine4.dll

4.8.4718.0

676,288

26-Mar-2024

04:21

webengine4.dll

4.8.4718.0

565,792

26-Mar-2024

04:52

WindowsBase.dll

4.8.4718.0

1,300,512

26-Mar-2024

04:28

WindowsFormsIntegration.dll

4.8.4614.0

102,336

26-Mar-2024

05:38

WorkflowServiceHostPerformanceCounters.dll

4.8.4110.0

102,672

26-Mar-2024

05:38

WorkflowServiceHostPerformanceCounters.dll

4.8.4110.0

89,368

26-Mar-2024

05:38

WPFFontCache_v0400.exe.mui

4.8.4718.0

13,248

26-Mar-2024

05:20

WPFFontCache_v0400.exe.mui

4.8.4718.0

13,248

26-Mar-2024

04:29

WPFFontCache_v0400.exe

4.8.4718.0

23,008

26-Mar-2024

05:20

WPFFontCache_v0400.exe

4.8.4718.0

21,048

26-Mar-2024

04:29

wpfgfx_v0400.dll

4.8.4718.0

2,052,016

26-Mar-2024

04:28

wpfgfx_v0400.dll

4.8.4718.0

1,620,512

26-Mar-2024

04:28

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