Applies to:

Microsoft .NET Framework 4.8

Summary

Denial of service vulnerabilities exist when .NET Framework improperly handles objects in heap memory, or when .NET Framework and .NET Core improperly process RegEx strings.

To learn more about the vulnerabilities, go to the following Common Vulnerabilities and Exposures (CVE).

Important

  • If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

Additional information about this update

For more information about this update as it relates to its particular Windows version(s), see the following article(s) in the Microsoft Knowledge Base:

  • 4498961 Security Only Update 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 Server 2008 R2 SP1 (KB4498961)

How to obtain and install the update

Method 1: Microsoft Update Catalog

To get the standalone package for this update, go to the Microsoft Update Catalog.

Method 2: Windows Software Update Services (WSUS)

On your WSUS server, follow these steps:

  1. Select Start, select Administrative Tools, and then select Microsoft Windows Server Update Services 3.0.

  2. Expand ComputerName, and then select Action.

  3. Select Import Updates.

  4. WSUS opens a browser window in which you may be prompted to install an ActiveX control. You must install the ActiveX control to continue.

  5. After the ActiveX control is installed, you see the Microsoft Update Catalog screen. Type 4498961 into the Search box, and then select Search.

  6. Locate the .NET Framework packages that match the operating systems, languages, and processors in your environment. Select Add to add them to your basket.

  7. After you select all the packages that you require, select View Basket.

  8. To import the packages to your WSUS server, select Import.

  9. After the packages are imported, select Close to return to WSUS.

The updates are now available for installation through WSUS.

Update deployment information

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

20190514 Security update deployment information: February 12, 2019

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 update 4481481.

File information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Note: The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.

File information

File hash information

File name

SHA1 hash

SHA256 hash

NDP48-KB4495627-x64.exe

C70CA60525A68E2FDF258F1E647FE0472AC0DECB

DA3AA333E0C16012F36EF5FB4ED1AF8030D9D6525D2C76F9AF7AD9EFECA204A3

NDP48-KB4495627-x86.exe

54911D02EA9C6572FAF6B6036C1E53172463C42A

35BA5964BB4855E6BB9F0AB0F10EEAF438B8A2E2FDB391AB3ACA105672DF8FD0

For all supported x64-based versions

File name

File version

File size

Date

Time

clr.dll

4.8.3801.0

11,268,656

09-Apr-2019

19:06

clr.dll

4.8.3801.0

8,042,240

09-Apr-2019

18:54

clrjit.dll

4.8.3801.0

1,364,528

09-Apr-2019

19:06

clrjit.dll

4.8.3801.0

560,688

09-Apr-2019

18:54

compatjit.dll

4.8.3801.0

1,280,048

09-Apr-2019

19:06

mscordacwks.dll

4.8.3801.0

1,807,920

09-Apr-2019

19:06

mscordacwks.dll

4.8.3801.0

1,314,344

09-Apr-2019

18:54

mscordbi.dll

4.8.3801.0

1,660,976

09-Apr-2019

19:06

mscordbi.dll

4.8.3801.0

1,195,056

09-Apr-2019

18:54

mscorlib.dll

4.8.3801.0

5,436,968

09-Apr-2019

19:06

mscorlib.dll

4.8.3801.0

5,676,288

09-Apr-2019

18:54

peverify.dll

4.8.3801.0

272,432

09-Apr-2019

19:06

peverify.dll

4.8.3801.0

189,720

09-Apr-2019

18:54

SOS.dll

4.8.3801.0

928,304

09-Apr-2019

19:06

SOS.dll

4.8.3801.0

774,192

09-Apr-2019

18:54

System.dll

4.8.3801.0

3,558,304

09-Apr-2019

18:54

For all supported x86-based versions

File name

File version

File size

Date

Time

clr.dll

4.8.3801.0

8,042,240

09-Apr-2019

18:54

clrjit.dll

4.8.3801.0

560,688

09-Apr-2019

18:54

mscordacwks.dll

4.8.3801.0

1,314,344

09-Apr-2019

18:54

mscordbi.dll

4.8.3801.0

1,195,056

09-Apr-2019

18:54

mscorlib.dll

4.8.3801.0

5,676,288

09-Apr-2019

18:54

peverify.dll

4.8.3801.0

189,720

09-Apr-2019

18:54

SOS.dll

4.8.3801.0

774,192

09-Apr-2019

18:54

System.dll

4.8.3801.0

3,558,304

09-Apr-2019

18:54

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