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Windows 10 Mobile Build 14393.2007 available with Spectre & Meltdown fixes for Anniversary update

Microsoft today released a new Windows 10 Mobile cumulative update Build 14393.2007 (10.0.14393.2007) to everyone on Anniversary update. As expected this cumulative update doesn’t bring anything new in terms of changes and features. It brings fixes for the recent Spectre and Meltdown vulnerabilities that affect even ARM processors. Read the full changelog below.

You can check the update availability by going to Settings–>Update & Security–>Windows update–>Check for updates.

Improvements and fixes

This update includes quality improvements. No new operating system features are being introduced in this update. Key changes include:

  • Security updates to Microsoft Edge, Internet Explorer, Windows Graphics, Windows Kernel, Windows Datacenter Networking, and Windows SMB Server.

Note This update isn’t available with express installation files for Windows Server 2016.

If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.

Known issues in this update

Symptom Workaround
When calling CoInitializeSecurity, the call will fail if passing RPC_C_IMP_LEVEL_NONE under certain conditions.

When calling CoInitializeSecurity, the call may fail when passing RPC_C_AUTHN_LEVEL_NONE as the authentication level. The error returned on failure is STATUS_BAD_IMPERSONATION_LEVEL.

Change the authentication level parameter to RPC_C_AUTHN_LEVEL_CALL.

Microsoft is working on a resolution and will provide an update in an upcoming release.

Due to an issue with some versions of Anti-Virus software, this fix is only being made applicable to the machines where the Anti virus ISV has updated the ALLOW REGKEY.

Contact your Anti-Virus AV to confirm that their software is compatible and have set the following REGKEY on the machine


Value Name=”cadca5fe-87d3-4b96-b7fb-a231484277cc”




How to get this update

This update will be downloaded and installed automatically from Windows Update. To get the standalone package for this update, go to the Microsoft Update Catalog website.

Nisha is the Managing Editor at WinCentral. She has more than 5 years of experience in covering Tech, Phones and Gadgets. She has also been associated with other well-known Tech sites GadgetOx and Nokiapoweruser. Her motto in life is “work hard party harder”!! Write to her at Email: [email protected]