Update KB4052623: Microsoft fixes Defender Scan Skip Bug

Microsoft has released an upgrade KB4052623 that will be available for Windows Defender anti-malware platform for Windows 10 on March 24 2020. This update also resolves the annoying message that files were not being scanned when an antivirus scan.

What’s the root of Defender scanning issue?

For the past few weeks, several Windows 10 users have been experiencing a weird issue while running a scan using Windows Defender. Although the scan is completed however, at the conclusion of the process, the scanner flags items that were skipped in the scan. The following message will be displayed.

I’ve covered the situation in greater detail in my blog entry Windows 10: Defender does not scan certain elements. Because the affected users didn’t identify exclusions from scanning the network, there was a lot of evidence that indicated that there was a problem with the scan on the network.

I later discovered in the blog article Windows 10: Fix for skipped Defender scans that the skipped files are a part in the process of a network scanner. This is also beneficial as scans of shared networks create an unnecessary burden.

In my blog post, I had advised people to not to bother with the message for now However, in the same post, I provided workarounds for changing the behavior. Also I had complained about the issue in Windows Update (Microsoft’s Twitter channel) along with the link to the English blog entry.

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Update KB4052623 corrects the Bug

Today, I got an email from a reader of my blog, Hans Tholen who told me about the latest update to his blog:

Today I found the opportunity to download from Windows Update the update for Windows Defender KB4052623 available. I’ve installed it. After that, I changed the settings for the scanning of network files to not be set. When I ran two scans, only the message regarding the progress of the scan was displayed.


The message about skipping didn’t appear the two times. It appears Microsoft have fixed this issue by implementing this.

Also German blog reader left this comment, pointing out, that update KB4052623 raised the Antimalware-Scan-Engine to version 4.18.2003.8 and that the toast notification about skipped elements during a scan has been vanished. There was a second note from a reader Pater with the same comment. We thank all our readers for their suggestions.

Update KB4052623 for Defender

The update to KB4052623 (Update on Windows Defender Antimalware Platform) is available for the following operating systems.

  • Windows 10 (Pro-, Enterprise as well as Home versions)
  • Windows Server 2019
  • Windows Server 2016

In the article on support, Microsoft writes that this package is a monthly update and bugs corrections to Windows Defender, the Windows Defender anti-malware platform that is utilized in conjunction with Windows Defender Antivirus in Windows 10. The article explains various problems (secure problems with booting, changes to paths, more network traffic) that could arise with this update.

Version 4.18.2001.10 of the scan engine has been identified as the reason for the increased network traffic (current version 4.18.2003.8). Microsoft is working to fix the issue internally and I believe that the files were removed in the scanner for network scanning within the anti-malware system between March 10 and March 10 or 10 in 2020. However, administrators are able to work around the issue by temporarily removing the protection of networks. I have specified the Group Policies that are needed for this reason in the blog article Windows 10: Fix for missing Security scans by Defender.

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Where can I get the information about the version and update?

KB4052623

In closing, here are two suggestions that may be interesting to some blog readers. I stayed up all night searching for updates under Windows Update, but only discovered the update mentioned by the author of Windows 10 190x: Update KB4541335. To determine whether there is an update available for Defender has been released, navigate to on the Settings screen and select Windows Security and choose the option Virus and Threat Protection.

If you scroll down to the bottom of the page, the current update status should appear Under Updates to the Virus and Threat Protection. These screenshots are taken via the screenshots I have taken from my German Windows. What is the best way to determine your version of antimalware?

Click the Settings icon located in the lower left corner within the Windows Security window. Then, on the Settings page scroll down until you click the About link. The page will then show all the information you require.

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