KB5010386 for Windows 11 – February Updates from Microsoft

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The cumulative update for Windows 11 for the month of February has been released on 8th February and it is called as KB5010386. This is one of the most interesting updates as it replaces the January updates. It also replaced the optional update released by Microsoft to improve user experience and performance on the Windows 11 based computers. We strongly suggest that you must patch the KB5010386 for a drastic improvement in performance on the Windows 11 based systems. What we can testify is that the KB5010386 will improve overall performance and speed on the computer. File explorer’s sluggish performance and memory leak issues have been resolved in this cumulative update. Just go for it, without a second thought.

Salient points about KB5010386 for Windows 11:

  • KB5010386 is cumulative.
  • It supersedes KB5009566, January updates.
  • It resolves slow file explorer issues on Windows 11.
  • KB5010386 must be patched on priority. It addresses a critical vulnerability – CVE-2022-21907 and a zero-day vulnerability CVE-2022-21984. Details of these vulnerabilities are given below.
  • No known complications have been reported after patching Windows 11 computers with KB5010386.
  • The update weighs 227.5 MB or 281 MB, depending on your computer architecture (x64 or ARM64)

Can I install KB5010386 without installing January updates on Windows 11 systems?

Yes, KB5010386 is a cumulative update that replaces the January cumulative updates:

  • KB5009566 – this is the original January update released on 11 January 2022. It caused several issues. The major issue happened in failed VPN connections on the Windows 11 client computers.
  • Issues of KB5009566 were resolved in an out of band band, KB5010795. KB5010795 was released on 17th January 2022. This, specifically, resolved the VPN connectivity issues and restored VPN connections on the Windows 11 client computers. You can download KB5010795 from the Microsoft catalog.
  • An optional update, KB5008353, was released in January 2022 to resolve multiple Windows 11 issues. Its main focus area was to improve performance and speed of file operations on the Windows 11 based computers. And, it achieved exactly that. You can read more about the optional update KB5008353 in detail on this page.

So, you can install KB5010386 without much ado. This one will boost Windows 11 performance and take care of small issues that have been causing some heartburn for Windows 11 administrators since the launch time.

  • KB5010386 for x64 based computer has a size of 227.5 MB.
  • KB5010386 for AMD64 based computer has a size of 281 MB.

If you have already patched Windows 11 with the January updates, only the incremental changes will be downloaded and installed on the Windows 11 computers. If you have not patched Windows 11 computers with the January updates on Windows 11 computers, you can skip those and install the February cumulative updates. This will update all the changes made during January and February on the Windows 11 computers.

What vulnerabilities have been resolved in KB5010386 for Windows 11?

There are two significant vulnerabilities that have been patched in this KB5010386 cumulative security update.

CVE-2022-21907 – There is a critical vulnerability on Windows 11 computers that relates to the HTTP protocol stack. The vulnerability carries a CVSS score of 9.8. It can lead to the Remote Code Execution attack through a vulnerability in the HTTP protocol stack. This was patched in January’s update KB5009566 for Windows 11. If you have not downloaded or applied the KB5009566 update on Windows 11, please download and apply KB5010386 on an immediate basis.

CVE-2022-21948 – There is a zero-day vulnerability, CVE-2022-21984 that affects the Microsoft DNS Server and carries a CVSS score of 8.8. This has a high impact for the associated computers and IT infrastructure. The vulnerability can lead to Remote Code Execution attacks on Windows 11 computers. Resolution for this vulnerability has been provided in the KB5010386 cumulative update for February.

There are other vulnerabilities as well. But, you would do well to consider patching these 2 vulnerabilities on priority. One is critical and the other is a zero-day threat.

Issues resolved in KB5010386 for Windows 11

If you have not patched the January updates on Windows 11, there is a whole set of improvements and bug fixes that have happened during the months of January and February for Windows 11. You may want to read more about Windows 11 updates for January and the optional update KB5008353 for Windows 11 to understand the complete set of improvements and bug fixes for Windows 11 computers.

Over and above the bug fixes and improvements resolved in January updates, the KB5010386 update resolves the issue with failed LDAP bindings that result in an error message – “Error: 0x20EF. The directory service encountered an unknown failure”.

How can I install KB5010386 on Windows 11 computers?

KB5010386 is a regular cumulative update. It is available for patching through all the regular means of updating Microsoft Windows. So, this implies that you can download and apply the Windows 11 cumulative updates through one of the following ways:

  • Windows Update – KB5010386 can be applied automatically through the Windows Update program.
  • Windows Update for Business – KB5010386 can be patched automatically through Windows Update for Business program.
  • WSUS – Windows Server Update service can be used for automatically importing and patching Windows 11 computers with KB5010386 cumulative update.
  • Microsoft Update Catalog – You can download the KB5010386 cumulative security update from the Microsoft Update catalog page. You will need to manually download the KB5010386 patch for x64 or AMD64 systems. The update for x64 system is 227.5 MB and the update for AMD64 is 281 MB in size.

Are there any issues after installing Windows 11 KB5010386 update?

Early adopters of the Windows 11 update for February, KB5010386, have given an all clear to the KB5010386 update. There are no issues that are associated with installing KB5010386 on Windows 11 computers. The feedback has been positive thus far.


KB5010386 is one of the best cumulative updates for Windows 11, as it brings out a lot of improvements in the functioning of Windows 11 based computers. Slow file explorer issues and memory leak issues have been addressed in the update. You must consider patching Windows 11 computers with KB5010386 at your convenience.

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Rajesh Dhawan

Rajesh Dhawan is a technology professional who loves to blog about smart wearables, Cloud computing and Microsoft technologies. He loves to break complex problems into manageable chunks of meaningful information.