Applies to:

Microsoft .NET Framework 3.5.1

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 and Server 2008 (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

Windows6.1-KB4495612-ia64.msu

55B87057CA662F6E10BE44FFACE703E102186271

3D26EAB9791B6FC29E378189C3FD344387BDC37DC2C66DAFD9A42AF7BC3D0C9F

Windows6.1-KB4495612-x64.msu

61245F7A7DD9A8E7939F31EB2BE1E288713764B8

B5DE9E5B34DD4149C37FBFB9018263D1650AD5F0A3DFC86C16EFB70A644F28AF

Windows6.1-KB4495612-x86.msu

BE5B9EA578ACBD9CFEBEBC050CB639A635546D3D

FEED5564BA0C3F3661C1294684F78D4D98006767952F4F79B8C740FF34F1A496

For all supported x64-based versions

File name

File version

File size

Date

Time

big5.nlp

66,728

13-Nov-2018

19:24

bopomofo.nlp

82,172

13-Nov-2018

19:24

ksc.nlp

116,756

13-Nov-2018

19:24

mscorlib.dll

2.0.50727.8806

4,575,232

29-Mar-2019

13:04

normidna.nlp

59,342

13-Nov-2018

19:25

normnfc.nlp

45,794

13-Nov-2018

19:25

normnfd.nlp

39,284

13-Nov-2018

19:25

normnfkc.nlp

66,384

13-Nov-2018

19:25

normnfkd.nlp

60,294

13-Nov-2018

19:25

prc.nlp

83,748

13-Nov-2018

19:25

prcp.nlp

83,748

13-Nov-2018

19:25

sortkey.nlp

262,148

13-Nov-2018

19:25

sorttbls.nlp

20,320

13-Nov-2018

19:25

xjis.nlp

28,288

13-Nov-2018

19:25

mscordacwks.dll

2.0.50727.8806

1,757,336

29-Mar-2019

13:04

mscorwks.dll

2.0.50727.8806

10,007,192

29-Mar-2019

13:04

sos.dll

2.0.50727.8806

486,040

29-Mar-2019

13:04

system.dll

2.0.50727.8806

3,211,264

29-Mar-2019

13:04

system.dll

2.0.50727.8806

3,211,264

29-Mar-2019

13:04

big5.nlp

66,728

13-Nov-2018

19:25

bopomofo.nlp

82,172

13-Nov-2018

19:25

ksc.nlp

116,756

13-Nov-2018

19:26

mscorlib.dll

2.0.50727.8806

4,558,848

29-Mar-2019

13:04

normidna.nlp

59,342

13-Nov-2018

19:27

normnfc.nlp

45,794

13-Nov-2018

19:27

normnfd.nlp

39,284

13-Nov-2018

19:27

normnfkc.nlp

66,384

13-Nov-2018

19:27

normnfkd.nlp

60,294

13-Nov-2018

19:27

prc.nlp

83,748

13-Nov-2018

19:27

prcp.nlp

83,748

13-Nov-2018

19:27

sortkey.nlp

262,148

13-Nov-2018

19:27

sorttbls.nlp

20,320

13-Nov-2018

19:27

xjis.nlp

28,288

13-Nov-2018

19:27

mscordacwks.dll

2.0.50727.8806

990,360

29-Mar-2019

13:04

mscorwks.dll

2.0.50727.8806

5,947,032

29-Mar-2019

13:04

sos.dll

2.0.50727.8806

389,784

29-Mar-2019

13:04

For all supported x86-based versions

File name

File version

File size

Date

Time

system.dll

2.0.50727.8806

3,211,264

29-Mar-2019

13:04

big5.nlp

66,728

13-Nov-2018

19:25

bopomofo.nlp

82,172

13-Nov-2018

19:25

ksc.nlp

116,756

13-Nov-2018

19:26

mscorlib.dll

2.0.50727.8806

4,558,848

29-Mar-2019

13:04

normidna.nlp

59,342

13-Nov-2018

19:27

normnfc.nlp

45,794

13-Nov-2018

19:27

normnfd.nlp

39,284

13-Nov-2018

19:27

normnfkc.nlp

66,384

13-Nov-2018

19:27

normnfkd.nlp

60,294

13-Nov-2018

19:27

prc.nlp

83,748

13-Nov-2018

19:27

prcp.nlp

83,748

13-Nov-2018

19:27

sortkey.nlp

262,148

13-Nov-2018

19:27

sorttbls.nlp

20,320

13-Nov-2018

19:27

xjis.nlp

28,288

13-Nov-2018

19:27

mscordacwks.dll

2.0.50727.8806

990,360

29-Mar-2019

13:04

mscorwks.dll

2.0.50727.8806

5,947,032

29-Mar-2019

13:04

sos.dll

2.0.50727.8806

389,784

29-Mar-2019

13:04

For all supported ia64-based versions

File name

File version

File size

Date

Time

big5.nlp

66,728

13-Nov-2018

19:28

bopomofo.nlp

82,172

13-Nov-2018

19:28

ksc.nlp

116,756

13-Nov-2018

19:28

mscorlib.dll

2.0.50727.8806

4,018,176

29-Mar-2019

13:04

normidna.nlp

59,342

13-Nov-2018

19:29

normnfc.nlp

45,794

13-Nov-2018

19:29

normnfd.nlp

39,284

13-Nov-2018

19:29

normnfkc.nlp

66,384

13-Nov-2018

19:29

normnfkd.nlp

60,294

13-Nov-2018

19:29

prc.nlp

83,748

13-Nov-2018

19:29

prcp.nlp

83,748

13-Nov-2018

19:29

sortkey.nlp

262,148

13-Nov-2018

19:29

sorttbls.nlp

20,320

13-Nov-2018

19:29

xjis.nlp

28,288

13-Nov-2018

19:29

mscordacwks.dll

2.0.50727.8806

3,083,416

29-Mar-2019

13:04

mscorwks.dll

2.0.50727.8806

20,404,888

29-Mar-2019

13:04

sos.dll

2.0.50727.8806

873,624

29-Mar-2019

13:04

system.dll

2.0.50727.8806

3,211,264

29-Mar-2019

13:04

system.dll

2.0.50727.8806

3,211,264

29-Mar-2019

13:04

big5.nlp

66,728

13-Nov-2018

19:25

bopomofo.nlp

82,172

13-Nov-2018

19:25

ksc.nlp

116,756

13-Nov-2018

19:26

mscorlib.dll

2.0.50727.8806

4,558,848

29-Mar-2019

13:04

normidna.nlp

59,342

13-Nov-2018

19:27

normnfc.nlp

45,794

13-Nov-2018

19:27

normnfd.nlp

39,284

13-Nov-2018

19:27

normnfkc.nlp

66,384

13-Nov-2018

19:27

normnfkd.nlp

60,294

13-Nov-2018

19:27

prc.nlp

83,748

13-Nov-2018

19:27

prcp.nlp

83,748

13-Nov-2018

19:27

sortkey.nlp

262,148

13-Nov-2018

19:27

sorttbls.nlp

20,320

13-Nov-2018

19:27

xjis.nlp

28,288

13-Nov-2018

19:27

mscordacwks.dll

2.0.50727.8806

990,360

29-Mar-2019

13:04

mscorwks.dll

2.0.50727.8806

5,947,032

29-Mar-2019

13:04

sos.dll

2.0.50727.8806

389,784

29-Mar-2019

13:04

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