On April 14, Microsoft released a set of cumulative updates for supported Windows 10 versions. KB4549951 is one of them, and it reportedly has a harmful behavior for some users.
Here is one of the reports:
Our environment: Pro Workstations Running 1909 on a Domain network.
This KB4549951 update slowed networking to a crawl. Outlook 365 on hosted Exchange took several minutes to load/or freeze and Remote Desktop loaded to black screen to the target computer(s). This update also causes VM ware to freeze. Everything resumed to normal following uninstall and setting Updates to defer for 30 days.
Some people are reporting that the update has a file deletion bug. For affected people, their files were moved or deleted following the update. Users say that after installing the update, their settings have been wiped out, personal files have been moved to the Recycle Bin, or simply deleted all together.
Interestingly, on some systems the buggy update doesn't remove files or settings. It just fails to install, or, when finally installed, it causes BSoDs, including PAGE_FAULT_IN_NONPAGED_AREA, CRITICAL_PROCESS_DIED, ACPI_BIOS_ERROR, INACCESSIBLE BOOT DEVICE, MEMORY_MANAGEMENT, DPC_WATCHDOG_VIOLATION.
Finally, for some users the update badly affects the OS performance, and causes network connectivity issues.
Microsoft hasn't acknowledged issues with the update at the moment of this writing. If you are affected, you can manually uninstall the KB4549951 update.
Source: Windows Latest
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