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 Server 2008 R2 SP1 (KB4499406)

**Applies to:**Microsoft .NET Framework 3.5.1 Microsoft .NET Framework 4.5.2 Microsoft .NET Framework 4.6 Microsoft .NET Framework 4.6.1 Microsoft .NET Framework 4.6.2 Microsoft .NET Framework 4.7 Microsoft .NET Framework 4.7.1 Microsoft .NET Framework 4.7.2 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).

• CVE-2019-0820

• CVE-2019-0980

• CVE-2019-0981

• CVE-2019-0864
  Important

• All updates for .NET Framework 4.7.2, 4.7.1, 4.7, 4.6.2, 4.6.1, and 4.6 require that the d3dcompiler_47.dll update is installed. We recommend that you install the included d3dcompiler_47.dll update before you apply this update. For more information about the d3dcompiler_47.dll, see KB 4019990.

• 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

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

• 4495606 Description of the Security and Quality Rollup for .NET Framework 3.5.1 for Windows 7 SP1 and Server 2008 R2 SP1 (KB4495606)
• 4495596 Description of the Security and Quality Rollup for .NET Framework 4.5.2 for Windows 7 SP1, Server 2008 R2 SP1, and Server 2008 (KB4495596)
• 4495588 Description of the Security and Quality Rollup for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2 for Windows 7 SP1 and Server 2008 R2 SP1 and .NET Framework 4.6 for Server 2008 (KB4495588)
• 4495626 Description of the Security and Quality Rollup for .NET Framework 4.8 for Windows 7 SP1 and Server 2008 R2 SP1 (KB4495626)

Information about protection and security

• Protect yourself online: Windows Security support
• Learn how we guard against cyber threats: Microsoft Security