Applies to:
Microsoft .NET Framework 4.8
Summary
This security update addresses a denial of service vulnerability in .NET Framework. For more information please see CVE-2021-24111.
Important
-
As a reminder to advanced IT administrators, updates to .NET Framework 3.5 for Windows 8.1 and Windows Server 2012 R2 should only be applied on systems where .NET Framework 3.5 is present and enabled. Customers who attempt to pre-install updates to .NET Framework 3.5 to offline images that do not contain the .NET Framework 3.5 product enabled will expose these systems to failures to enable .NET Framework 3.5 after the systems are online. For more extensive information about deploying .NET Framework 3.5, see Microsoft .NET Framework 3.5 Deployment Considerations.
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All updates for Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2 require that update KB 2919355 is installed. We recommend that you install update KB 2919355 on your Windows 8.1-based, Windows RT 8.1-based, or Windows Server 2012 R2-based computer so that you receive updates in the future.
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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.
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4602960 Description of the Security Only Update for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows 8.1 and Windows Server 2012 R2 (KB4602960)
How to obtain and install the update
Before installing this update
Prerequisite:
To apply this update, you must have .NET Framework 4.8 installed.
Install this update
|
Release Channel |
Available |
Next Step |
|
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 update will automatically sync with WSUS if you configure Products and Classifications as follows: Product:Windows 8.1 and Windows Server 2012 R2 Classification: Security Updates |
Restart requirement
You must 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, go to the following article in the Microsoft Knowledge Base:
20210209 Security update deployment information: February 9, 2021
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.
File Information
|
File name |
File version |
File size |
Date |
Time |
Platform |
SP requirement |
Service branch |
|
Aspnet_perf.dll |
4.8.4330.0 |
41,864 |
05-Jan-2021 |
01:27 |
x64 |
SPN |
AMD64_NETFX4-ASP |
|
Aspnet_state_perf.h |
Not applicable |
318 |
04-Jan-2021 |
23:56 |
Not applicable |
SPN |
AMD64_NETFX4-ASP |
|
Aspnet_state_perf.ini |
Not applicable |
42,996 |
05-Jan-2021 |
01:28 |
Not applicable |
SPN |
AMD64_NETFX4-ASP |
|
Aspnet_wp.exe |
4.8.4330.0 |
45,456 |
05-Jan-2021 |
01:27 |
x64 |
SPN |
AMD64_NETFX4-ASP |
|
System.web.applicationservices.dll |
4.8.4330.0 |
63,768 |
05-Jan-2021 |
01:30 |
x86 |
None |
Not applicable |
|
System.web.extensions.dll |
4.8.4330.0 |
1,842,448 |
05-Jan-2021 |
01:30 |
x86 |
None |
Not applicable |
|
Webengine4.dll |
4.8.4330.0 |
675,208 |
05-Jan-2021 |
01:27 |
x64 |
None |
Not applicable |
|
Webengine.dll |
4.8.4330.0 |
21,376 |
05-Jan-2021 |
01:27 |
x64 |
None |
Not applicable |
|
System.web.dll |
4.8.4330.0 |
5,397,896 |
05-Jan-2021 |
01:27 |
x64 |
None |
Not applicable |
|
System.web.applicationservices.dll |
4.8.4330.0 |
63,768 |
05-Jan-2021 |
01:30 |
x86 |
None |
Not applicable |
|
System.web.extensions.dll |
4.8.4330.0 |
1,842,448 |
05-Jan-2021 |
01:30 |
x86 |
None |
Not applicable |
|
Aspnet_perf.dll |
4.8.4330.0 |
36,232 |
05-Jan-2021 |
01:30 |
x86 |
SPN |
X86_NETFX4-ASP |
|
Aspnet_state_perf.h |
Not applicable |
318 |
04-Jan-2021 |
23:56 |
Not applicable |
SPN |
X86_NETFX4-ASP |
|
Aspnet_state_perf.ini |
Not applicable |
42,996 |
05-Jan-2021 |
01:31 |
Not applicable |
SPN |
X86_NETFX4-ASP |
|
Aspnet_wp.exe |
4.8.4330.0 |
39,824 |
05-Jan-2021 |
01:30 |
x86 |
SPN |
X86_NETFX4-ASP |
|
System.web.extensions.dll |
4.8.4330.0 |
1,842,448 |
05-Jan-2021 |
01:30 |
x86 |
None |
Not applicable |
|
Webengine4.dll |
4.8.4330.0 |
564,616 |
05-Jan-2021 |
01:30 |
x86 |
None |
Not applicable |
|
Webengine.dll |
4.8.4330.0 |
19,328 |
05-Jan-2021 |
01:30 |
x86 |
None |
Not applicable |
|
System.web.dll |
4.8.4330.0 |
5,410,184 |
05-Jan-2021 |
01:30 |
x86 |
None |
Not applicable |
|
File name |
File version |
File size |
Date |
Time |
Platform |
|
System.web.extensions.dll |
4.8.4330.0 |
1,842,448 |
05-Jan-2021 |
01:30 |
x86 |
|
System.web.dll |
4.8.4330.0 |
5,418,264 |
05-Jan-2021 |
01:27 |
Not applicable |
|
System.web.applicationservices.dll |
4.8.4330.0 |
63,768 |
05-Jan-2021 |
01:30 |
x86 |
|
System.web.extensions.dll |
4.8.4330.0 |
1,842,448 |
05-Jan-2021 |
01:30 |
x86 |
|
File name |
File version |
File size |
Date |
Time |
Platform |
SP requirement |
Service branch |
|
System.web.applicationservices.dll |
4.8.4330.0 |
63,768 |
05-Jan-2021 |
01:30 |
x86 |
None |
Not applicable |
|
System.web.extensions.dll |
4.8.4330.0 |
1,842,448 |
05-Jan-2021 |
01:30 |
x86 |
None |
Not applicable |
|
Aspnet_perf.dll |
4.8.4330.0 |
36,232 |
05-Jan-2021 |
01:30 |
x86 |
SPN |
X86_NETFX4-ASP |
|
Aspnet_state_perf.h |
Not applicable |
318 |
04-Jan-2021 |
23:56 |
Not applicable |
SPN |
X86_NETFX4-ASP |
|
Aspnet_state_perf.ini |
Not applicable |
42,996 |
05-Jan-2021 |
01:31 |
Not applicable |
SPN |
X86_NETFX4-ASP |
|
Aspnet_wp.exe |
4.8.4330.0 |
39,824 |
05-Jan-2021 |
01:30 |
x86 |
SPN |
X86_NETFX4-ASP |
|
System.web.extensions.dll |
4.8.4330.0 |
1,842,448 |
05-Jan-2021 |
01:30 |
x86 |
None |
Not applicable |
|
Webengine4.dll |
4.8.4330.0 |
564,616 |
05-Jan-2021 |
01:30 |
x86 |
None |
Not applicable |
|
Webengine.dll |
4.8.4330.0 |
19,328 |
05-Jan-2021 |
01:30 |
x86 |
None |
Not applicable |
|
System.web.dll |
4.8.4330.0 |
5,410,184 |
05-Jan-2021 |
01:30 |
x86 |
None |
Not applicable |
Information about protection and security
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Protect yourself online: Windows Security support
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Learn how we guard against cyber threats: Microsoft Security
