January 9, 2024-KB5034276 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 11, version 21H2

2024-03-2207:00:00

Microsoft

support.microsoft.com

security update

windows 11

version 21h2

denial of service vulnerability

security feature bypass

elevation of privilege

remote code execution

http.net remoting

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

8.9 High

AI Score

Confidence

High

0.009 Low

EPSS

Percentile

83.1%

JSON

January 9, 2024-KB5034276 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 11, version 21H2

Release Date:
January 9, 2024 Version: ** .NET Framework 3.5, 4.8 and 4.8.1**

Summary

This article describes the security and cumulative update for 3.5, 4.8 and 4.8.1 for Windows 11, version 21H2. Security Improvements CVE-2023-36042 – .NET Framework Denial of Service Vulnerability
This security update addresses a security feature bypass vulnerability detailed in CVE-2023-36042. CVE-2024-0056 – .NET Framework Security Feature Bypass Vulnerability
This security update addresses a security feature bypass vulnerability detailed in CVE-2024-0056 . CVE-2024-0057 – .NET Framework Security Feature Vulnerability
This security update addresses a elevation of privilege vulnerability detailed in CVE-2024-0057. CVE-2024-21312 – .NET Framework Denial of Service Vulnerability
This security update addresses a denial of service vulnerability detailed in CVE-2024-21312 . .NET Framework Remote Code Execution Vulnerability
This security update addresses a remote code execution vulnerability to HTTP .NET remoting server channel chain. Quality and Reliability ImprovementsFor a list of improvements that were released with this update, please see the article links in the Additional Information section of this article.

Known issues in this update

Microsoft is not currently aware of any issues in this update.

Additional information about this update

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

5033912 Description of the Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 11 (KB5033912)
5033919 Description of the Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11 (KB5033919)

How to get this update

Release Channel	Available	Next Step
Windows Update and Microsoft Update	Yes	None. This update will be downloaded and installed automatically from Windows Update.
Windows Update for Business	Yes	None. This update will be downloaded and installed automatically from Windows Update.
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 operating system update will offer, as applicable, and individual .NET Framework product updates will be installed. For more information about individual .NET Framework product updates see additional information about this update section. This update will automatically sync with WSUS if you configure as follows: Product: Windows 11, version 21H2Classification: Security Updates