Windows 10 June update (KB4494441) is causing bluetooth issues

Microsoft has now acknowledged a brand new bug in cumulative update KB4494441 is affecting Windows 10 October 2018 Update (version 1809). Microsoft released KB4494441 on May 14, 2019. Windows 10 June update, which is bringing in a considerable number of security fixes regularly, is seemingly having an issue which could possibly break your outdated Bluetooth devices as some may no longer be able to pair successfully. The issue first came into light on June 14th.

“Devices with Realtek Bluetooth radios may not pair or connect as expected,” Microsoft explains. “Devices with Realtek Bluetooth radios in some circumstances may have issues pairing or connecting to devices.”

“You may experience issues pairing, connecting or using certain Bluetooth devices after installing security updates released June 11, 2019. These security updates address a security vulnerability by intentionally preventing connections from Windows to unsecure Bluetooth devices. Any device using well-known keys to encrypt connections may be affected, including certain security fobs,” Microsoft wrote in its support document.

To determine if your Bluetooth device is affected, access the Event Log and look for the error message, “Your Bluetooth device attempted to establish a debug connection.  The Windows Bluetooth stack does not allow debug connection while it is not in the debug mode.” 

The following latest cumulative updates (LCUs) and Monthly Rollups released on and after June 11, 2019 for the affected platforms will be experiencing the bug:

  • KB4503293 or later LCU for Windows 10, version 1903.
  • KB4503327 or later LCU for Windows 10, version 1809 and Windows Server 2019.
  • KB4503286 or later LCU for Windows 10, version 1803.
  • KB4503284 or later LCU for Windows 10, version 1709.
  • KB4503279 or later LCU for Windows 10, version 1703.
  • KB4503267 or later LCU for Windows 10, version 1607 and Windows Server 2016.
  • KB4503291 or later LCU for Windows 10, version 1507.
  • KB4503276 or later Monthly Rollup for Windows 8.1 and Windows Server 2012 R2.
  • KB4503285 or later Monthly Rollup for Windows Server 2012 and Windows Embedded 8 Standard.

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