October 13, 2020
.NET Framework 3.5, 4.7.2 and 4.8
Note On Jan 12, 2020, a live revision was made to this update to remove its supersedence relationship with the October 13, 2020, .NET Framework security updates. If you have already installed this update, the October 13 .NET Framework updates, or any later .NET Framework updates, you do not have to take any action to be up-to-date for the latest .NET Framework security updates. See the “Update replacement information” section in this article for more information for WSUS administrators.
WSUS administrators who cannot install this update and have to reinstate the October 13, 2020, KB 4579976 security update, if it was declined, can follow this guidance: Reinstating declined updates. Then, they should run an update synchronization within their Microsoft Endpoint Configuration Manager, or update management environments, as applicable.
The November 10, 2020 update for Windows 10, version 1809 and Windows Server, version 2019 includes cumulative reliability improvements in .NET Framework 4.8. We recommend that you apply this update as part of your regular maintenance routines. Before you install this update, see the Prerequisites and Restart requirement sections.
An information disclosure vulnerability exists when the .NET Framework improperly handles objects in memory. An attacker who successfully exploited the vulnerability could disclose contents of an affected system's memory. To exploit the vulnerability, an authenticated attacker would need to run a specially crafted application. The update addresses the vulnerability by correcting how the .NET Framework handles objects in memory.
To learn more about the vulnerabilities, go to the following Common Vulnerabilities and Exposures (CVE).
For a list of improvements that were released with this update, please see the article links in the Additional Information section of this article.
Additional information about this update
- 4578966 Description of the Cumulative Update for .NET Framework 3.5 and 4.7.2 for Windows 10, version 1809 and Windows Server, version 2019 (KB4578966)
- 4578973 Description of the Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10, version 1809 and Windows Server, version 2019 (KB4578973)