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Release Date:

10/12/2021

Version:

OS Build 18363.1854

8/24/2021
REMINDER Starting in October 2021, there are no optional, non-security releases (known as "C" releases) for Windows 10, version 1909.  Only cumulative monthly security updates (known as the "B" or Update Tuesday release) will continue for Windows 10, version 1909. 

11/19/20
For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. For an overview of Windows 10, version 1909, see its update history page.

Note Follow @WindowsUpdate to find out when new content is published to the release information dashboard.

Highlights

  • Updates security for your Windows operating system. 

Improvements and fixes

This security update includes quality improvements. Key changes include:

  • Addresses a known issue that prevents an internet print server from properly packaging modified printer properties before sending the package to the client. 

  • Addresses an issue that prevents some applications, such as Microsoft Office and Adobe Reader, from opening or causes them to stop responding. This occurs on devices that are subject to Microsoft Exploit Protection for Export Address Filtering (EAF).

  • Addresses a known issue that might ask for administrative credentials every time you attempt to print. This occurs in environments in which the print server and print client are in different times zones.

If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device. 

For more information about the resolved security vulnerabilities, please refer to the new Security Update Guide website and the October 2021 Security Updates.

Windows 10 servicing stack update - 18363.1850

  • This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates.  

Known issues in this update

Symptom

Workaround

After installing KB5005566, installation of printers using Internet Printing Protocol (IPP) might not complete successfully. Devices which had connected to and installed the printer prior to the installation of KB5005566 are unaffected and print operations to that printer will succeed as usual.

Note IPP is not commonly used by devices designed for home use. The printing environments affected by this issue are more commonly found in enterprises and organizations.

This issue is resolved in KB5007189.

After installing this update, Windows print clients might encounter the following errors when connecting to a remote printer shared on a Windows print server:

  • 0x000006e4 (RPC_S_CANNOT_SUPPORT)

  • 0x0000007c (ERROR_INVALID_LEVEL)

  • 0x00000709 (ERROR_INVALID_PRINTER_NAME)

Note The printer connection issues described in this issue are specific to print servers and are not commonly observed in devices designed for home use. Printing environments affected by this issue are more commonly found in enterprises and organizations.

For workarounds and the latest status for this issue, please see Windows release health.

We are presently investigating and will provide an update in an upcoming release.

How to get this update

Before installing this update

Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

Prerequisite:

You must install the July 13, 2021 SSU (KB5004748) before installing the LCU. 

Install 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 in accordance with configured policies.

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 10, version 1903 and later

Classification: Security Updates

If you want to remove the LCU

To remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument. You can find the package name by using this command: DISM /online /get-packages.

Running Windows Update Standalone Installer (wusa.exe) with the /uninstall switch on the combined package will not work because the combined package contains the SSU. You cannot remove the SSU from the system after installation.

File information

For a list of the files that are provided in this update, download the file information for cumulative update 5006667

For a list of the files that are provided in the servicing stack update, download the file information for the SSU - version 18363.1850

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