Cumulative Updates for Windows 10, February 9, 2021

Today is Patch Tuesday, so Microsoft is updating supported Windows 10 versions by releasing patches for version 20H2 and older. Also, 20H2 Build 19042.804 (KB4601319) is available to Insiders in Beta and Release Preview channels. Here's what's new.

Windows 10 20H2 Build 19042.804 + version 2004 build 19041.804 (KB4601319)

• Addresses a possible elevation of privilege vulnerability in the win32k component.
• Addresses an issue that might damage the file system of some devices and prevent them from starting up after running chkdsk /f.
• Security updates to the Windows App Platform and Frameworks, Windows Apps, Windows Input and Composition, Windows Cloud Infrastructure, Windows Management, Windows Authentication, Windows Fundamentals, Windows Cryptography, Windows Virtualization, Windows Core Networking, and Windows Hybrid Cloud Networking.

Windows 10, version 1909, KB4601315 (OS Build 18363.1377)

+

Windows 10, version 1809, KB4601345 (OS Build 17763.1757)

• Addresses a possible elevation of privilege vulnerability in the win32k component.

• Security updates to Windows App Platform and Frameworks, Windows Apps, Windows Input and Composition, Windows Cloud Infrastructure, Windows Management, Windows Authentication, Windows Fundamentals, Windows Cryptography, Windows Virtualization, Windows Core Networking, and Windows Hybrid Cloud Networking.

Windows 10, version 1803, KB4601354 (OS Build 17134.2026)

• Updates Internet Explorer’s About dialog to use the standard modern dialog.

• Addresses a possible elevation of privilege vulnerability in the win32k component.
• Corrects historical daylight savings time (DST) information for the Palestinian Authority.
• Addresses an issue with German translations of Central European Time.
• Addresses an issue that causes LSASS.exe to stop working because of a race condition that results in a double free error in Schannel. The exception code is c0000374, and the Event Log displays Schannel event 36888, fatal error code 20, and error state 960. This issue occurs after installing Windows updates from September 2020 and later.
• Security updates to Windows App Platform and Frameworks, Windows Apps, Windows Graphics, Windows Input and Composition, Windows Cloud Infrastructure, Windows Authentication, Windows Fundamentals, Windows Cryptography, and Windows Core Networking.

Windows 10, version 1703, KB4601330 (OS Build 15063.2642)

• Addresses a possible elevation of privilege vulnerability in the win32k component.

• Corrects historical daylight savings time (DST) information for the Palestinian Authority.
• Security updates to Windows App Platform and Frameworks, Windows Apps, Windows Input and Composition, Windows Authentication, Windows Fundamentals, and Windows Core Networking.

Windows 10, version 1607, KB4601318 (OS Build 14393.4225)

• Enables administrators to disable standalone Internet Explorer using a Group Policy while continuing to use Microsoft Edge's IE Mode.

• Updates Internet Explorer’s About dialog to use the standard modern dialog.
• Addresses an issue with a Service Host (svchost.exe) process that causes excessive CPU usage in some Input Method Editor (IME) language environments, such as Traditional Chinese. This issue occurs when you try to add an input method in Control Panel.
• Corrects historical daylight savings time (DST) information for the Palestinian Authority.
• Addresses an issue with German translations of Central European Time.
• Addresses an issue that causes LSASS.exe to stop working because of a race condition that results in a double free error in Schannel. The exception code is c0000374, and the Event Log displays Schannel event 36888, fatal error code 20, and error state 960. This issue occurs after installing Windows updates from September 2020 and later.
• Addresses an issue that might cause systems that use BitLocker to stop working and display the error 0x120 (BITLOCKER_FATAL_ERROR).
• Addresses an issue that prevents scheduled tasks that have multiple actions from running again if you have previously disabled them while they were running.
• Addresses an issue that fails to log events 4732 and 4733 for Domain-Local group membership changes in certain scenarios. This occurs when you use the “Permissive Modify” control; for example, the Active Directory (AD) PowerShell modules use this control.
• Addresses an issue that incorrectly reports that Lightweight Directory Access Protocol (LDAP) sessions are unsecure in Event ID 2889. This occurs when the LDAP session is authenticated and sealed with a Simple Authentication and Security Layer (SASL) method.
• Addresses an issue with Server Message Block (SMB). This issue incorrectly logs the Microsoft-Windows-SMBClient 31013 event in the Microsoft-Windows-SMBClient or Security event log of an SMB client when an SMB server returns STATUS_USER_SESSION_DELETED. This issue occurs when SMB client users or applications open multiple SMB sessions using the same set of Transmission Control Protocol (TCP) connections on the same SMB Server. This issue most likely occurs on Remote Desktop Servers.
• Addresses an issue that causes the LanmanServer service to stop unexpectedly. This issue occurs if the OptionalNames registry value is set and the service restarts.
• Addresses an issue that causes stop error 0x54 in SRV2.SYS.
• Security updates to Windows App Platform and Frameworks, Windows Apps, Windows Cloud Infrastructure, Windows Authentication, Windows Fundamentals, Windows Virtualization, Windows Core Networking, and Windows Hybrid Cloud Networking.

Windows 10, Initial version, KB4601331 (OS Build 10240.18842)

• Enables administrators to disable standalone Internet Explorer using a Group Policy while continuing to use Microsoft Edge's IE Mode.

• Updates Internet Explorer’s About dialog to use the standard modern dialog.
• Corrects historical daylight savings time (DST) information for the Palestinian Authority.
• Addresses an issue with German translations of Central European Time.
• Addresses an issue that causes LSASS.exe to stop working because of a race condition that results in a double free error in Schannel. The exception code is c0000374, and the Event Log displays Schannel event 36888, fatal error code 20, and error state 960. This issue occurs after installing Windows updates from September 2020 and later.
• Security updates to Windows App Platform and Frameworks, Windows Apps, Windows Authentication, Windows Fundamentals, and Windows Core Networking.

Check out the Windows Update History website to see prerequisites for the packages, and read about known issues (if any).

How to install the updates

To download these updates, open Settings - > Update & recovery and click on the Check for Updates button on the right.

Alternatively, you can get it from the Windows Update online catalog.

Helpful links

• Find Which Windows 10 Edition You Have Installed
• How to find the Windows 10 version you are running
• How to find the Windows 10 build number you are running
• How to install CAB and MSU updates in Windows 10