Microsoft fixes Windows Defender scanning bug

Posted on Friday, March 27 2020 @ 9:57 CET by Thomas De Maesschalck
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Earlier this week we wrote about a bug in Windows Defender version 4.18.2003 that resulted in incomplete system scans. Now Bleeping Computer reports that Microsoft quietly fixed the problem via the KB4052623 update for the Windows Defender, which updates the scan engine to version 4.18.2003.8.

The problem was caused by Microsoft's decision to temporarily turn off network scanning:
The bug was caused by a Windows Defender scanner engine update that automatically disabled network scanning for newer versions, after previously having them enabled before the updates released during this month's Patch Tuesday.

Microsoft's decision to turn off network scanning in Windows Defender might have been prompted by a high network traffic issue as detailed in KB4052623's description.

"Enterprises that use Network Protection in either Audit or Block mode may experience greater than expected network traffic departing their networks to Microsoft Defender SmartScreen-associated domains," the knowledgebase article says.

About the Author

Thomas De Maesschalck

Thomas has been messing with computer since early childhood and firmly believes the Internet is the best thing since sliced bread. Enjoys playing with new tech, is fascinated by science, and passionate about financial markets. When not behind a computer, he can be found with running shoes on or lifting heavy weights in the weight room.

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