July 6, 2021—KB5004945 (OS Builds 19041.1083, 19042.1083, and 19043.1083) Out-of-band
Highlights
Updates a remote code execution exploit in the Windows Print Spooler service, known as “PrintNightmare”, as documented in CVE-2021-34527.
Improvements and fixes
Note: To view the list of addressed issues, click or tap the OS name to expand the collapsible section.
Windows 10 servicing stack update - 19041.1081, 19042.1081, and 19043.1081
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.
Windows 10, version 21H1
This security update includes quality improvements. Key changes include:
This build includes all the improvements from Windows 10, version 2004.
No additional issues were documented for this release.
Windows 10, version 20H2
This security update includes quality improvements. Key changes include:
This build includes all the improvements from Windows 10, version 2004.
No additional issues were documented for this release.
Windows 10, version 2004
This security update includes quality improvements. Key changes include:
Addresses a remote code execution exploit in the Windows Print Spooler service, known as “PrintNightmare”, as documented in CVE-2021-34527. After installing this and later Windows updates, users who are not administrators can only install signed print drivers to a print server. By default, administrators can install signed and unsigned printer drivers to a print server. The installed root certificates in the system’s Trusted Root Certification Authorities trusts signed drivers. Microsoft recommends that you immediately install this update on all supported Windows client and server operating system, starting with devices that currently host the print server role. You also have the option to configure the RestrictDriverInstallationToAdministrators registry setting to prevent non-administrators from installing signed printer drivers on a print server. For more information, see KB5005010.
If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.
July 6, 2021—KB5004945 (OS Builds 19041.1083, 19042.1083, and 19043.1083) Out-of-band
Microsoft published has released KB5004945 for Windows 10 version 2004, Windows Server version 2004, Windows 10 version 20H2, Windows Server version 20H2, and Windows 10 version 21H1 to address a remote code execution exploit in the Windows Print Spooler service known as PrintNightmare.
