November 10, 2020 - KB4586845 (Monthly Rollup)
Applies to: Windows 8.1, Windows Server 2012 R2, Windows Embedded 8.1 Industry Enterprise, Windows Embedded 8.1 Industry Pro
IMPORTANT Windows 8.1 and Windows Server 2012 R2 have reached the end of mainstream support and are now in extended support. Starting in July 2020, there will no longer be optional, non-security releases (known as "C" releases) for this operating system. Operating systems in extended support have only cumulative monthly security updates (known as the "B" or Update Tuesday release).
NEW 11/10/20
For more information about the various types of Windows updates, such as critical, security, driver, service packs, and so on, please see the following article. To view other notes and messages, see the Windows 8.1 and Windows Server 2012 R2 update history home page.
Improvements and fixes
This security update includes improvements and fixes that were a part of update KB4580347 (released October 13, 2020) and addresses the following issues:
For more information about the resolved security vulnerabilities, please refer to the new Security Update Guide website.
- Corrects the DST start date for the Fiji Islands to December 20, 2020.
- Allows administrators to enable "Save target as" through Group Policy for users in Microsoft Edge IE mode.
- Addresses an issue in which LDAP sessions authenticated and sealed with a SASL method are reported incorrectly in Events 2889 in the Directory Services Eventlog from source Microsoft-Windows-ActiveDirectory_DomainService as unsecure sessions.
- Security updates to Windows Graphics, Windows Silicon Platform, Windows Authentication, Windows Core Networking, Windows Peripherals, Windows Network Security and Containers, Windows Hybrid Storage Services, Windows Remote Desktop, and Microsoft Scripting Engine.
Known issues in this update
How to get this update
Before installing this update
We strongly recommend that you install the latest servicing stack update (SSU) for your operating system before you install the latest Rollup. SSUs improve the reliability of the update process to mitigate potential issues while installing the Rollup and applying Microsoft security fixes. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
If you use Windows Update, the latest SSU (KB4566425) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.
Install this update
File information
For a list of the files that are provided in this update, download the file information for update 4586845.
Source: https://support.microsoft.com/en-us/help/4586845
Direct download links for KB4586845 MSU file from Microsoft Update Catalog:
Download KB4586845 MSU for Windows 8.1 32-bit (x86) - 344.9 MB
Download KB4586845 MSU for Windows 8.1 64-bit (x64) - 532.1 MB