July 29, 2021—KB5005393 (OS Build 14393.4532) Out-of-band
Highlights
Updates an issue that might prevent printers, scanners, and multifunction devices from working. This issue occurs on devices that do not comply with a certain specification and use smart card authentication.
Improvements and fixes
This non-security update includes quality improvements. Key changes include:
Temporarily addresses an issue with devices that do not comply with section 3.2.1 of the RFC 4556 specification, which is required for CVE-2021-33764. Noncompliant printers, scanners, and multifunction devices might not work when you use smart card authentication (PIV). You must enable this temporary mitigation using a registry key. Otherwise, this issue will occur after you install the July 13, 2021 or later update on domain controllers (DC) in your environment.
Important You must have your noncompliant devices updated and compliant or replaced by February 8, 2022. After that, the mitigation will not work in security updates. For more information, see KB5005408.
If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.
Microsoft has released KB5005393 for Windows 10 version 1607 and Windows Server 2016.
