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:.

  • 4498962 Security Only Update for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Server 2012 (KB4498962)

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 4498962 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 4481483.

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

Windows8-RT-KB4495623-x64.msu

9F4BBA71FAC9D2E2558433925A99F61E52905D3B

B6ABCDF0B08E410D3BCD031DF042AEB9FAB0A761E517C48CE918602E22F6D124

Windows8-RT-KB4495623-x86.msu

83A4CEC56D12EFCA57C9C46D57BD36F909A6C7E9

0C681435CD255E4E7177DC354695FE181628724E1BC641D19B1A019391ADB6DC

For all supported x64-based versions

File name

File version

File size

Date

Time

mscorlib.dll

4.8.3801.0

5,436,968

09-Apr-2019

03:24

normidna.nlp

59,342

27-Sep-2018

20:42

normnfc.nlp

47,076

27-Sep-2018

20:42

normnfd.nlp

40,566

27-Sep-2018

20:42

normnfkc.nlp

67,808

27-Sep-2018

20:42

normnfkd.nlp

61,718

27-Sep-2018

20:42

clrjit.dll

4.8.3801.0

1,364,528

09-Apr-2019

03:24

clr.dll

4.8.3801.0

11,268,656

09-Apr-2019

03:24

compatjit.dll

4.8.3801.0

1,280,048

09-Apr-2019

03:24

mscordacwks.dll

4.8.3801.0

1,807,920

09-Apr-2019

03:24

mscordbi.dll

4.8.3801.0

1,660,976

09-Apr-2019

03:24

peverify.dll

4.8.3801.0

272,432

09-Apr-2019

03:24

sos.dll

4.8.3801.0

928,304

09-Apr-2019

03:24

system.dll

4.8.3801.0

3,558,304

09-Apr-2019

03:27

system.dll

4.8.3801.0

3,558,304

09-Apr-2019

03:27

mscorlib.dll

4.8.3801.0

5,676,288

09-Apr-2019

03:27

normidna.nlp

59,342

27-Sep-2018

20:42

normnfc.nlp

47,076

27-Sep-2018

20:42

normnfd.nlp

40,566

27-Sep-2018

20:42

normnfkc.nlp

67,808

27-Sep-2018

20:42

normnfkd.nlp

61,718

27-Sep-2018

20:42

clrjit.dll

4.8.3801.0

560,688

09-Apr-2019

03:27

clr.dll

4.8.3801.0

8,042,240

09-Apr-2019

03:27

mscordacwks.dll

4.8.3801.0

1,314,344

09-Apr-2019

03:27

mscordbi.dll

4.8.3801.0

1,195,056

09-Apr-2019

03:27

peverify.dll

4.8.3801.0

189,720

09-Apr-2019

03:27

sos.dll

4.8.3801.0

774,192

09-Apr-2019

03:27

For all supported x86-based versions

File name

File version

File size

Date

Time

system.dll

4.8.3801.0

3,558,304

09-Apr-2019

03:27

mscorlib.dll

4.8.3801.0

5,676,288

09-Apr-2019

03:27

normidna.nlp

59,342

27-Sep-2018

20:42

normnfc.nlp

47,076

27-Sep-2018

20:42

normnfd.nlp

40,566

27-Sep-2018

20:42

normnfkc.nlp

67,808

27-Sep-2018

20:42

normnfkd.nlp

61,718

27-Sep-2018

20:42

clrjit.dll

4.8.3801.0

560,688

09-Apr-2019

03:27

clr.dll

4.8.3801.0

8,042,240

09-Apr-2019

03:27

mscordacwks.dll

4.8.3801.0

1,314,344

09-Apr-2019

03:27

mscordbi.dll

4.8.3801.0

1,195,056

09-Apr-2019

03:27

peverify.dll

4.8.3801.0

189,720

09-Apr-2019

03:27

sos.dll

4.8.3801.0

774,192

09-Apr-2019

03:27

Information about protection and security

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

What affected your experience?

Thank you for your feedback!

×