KB4078407 Update to enable mitigation against Spectre, Variant 2

  1. Brink's Avatar
    Posts : 42,164
    64-bit Windows 10 Pro for Workstations build 18980

    KB4078407 Update to enable mitigation against Spectre, Variant 2

    Update to enable mitigation against Spectre, Variant 2

    Applies to: Windows 10 version 1709, Windows Server 2016 Version 1709, Windows 10 Version 1703, Windows 10 Version 1607, Windows Server 2016, Windows Server 2016 Datacenter, Windows Server 2016 Essentials, Windows Server 2016 Standard, Windows 10


    Applying this update will enable the Spectre Variant 2 mitigation CVE-2017-5715 - “Branch target injection vulnerability.”

    Advanced users can also manually enable mitigation against Spectre, Variant 2 through the registry settings documented in the following articles:

    To learn more about Spectre Variant 2, go to the following Security Advisory:

    Consult with your device manufacturer’s and Intel’s websites regarding their microcode recommendation for your device before applying this update to your device.

    How to get this update

    To get the stand-alone package for this update, go to the Microsoft Update Catalog website.

    More Information

    Known issues in this update

    Microsoft is not aware of any issues that affect this update currently.


    There are no prerequisites to apply this update.

    Registry information

    To apply this update, you don't have to make any changes to the registry.

    Restart requirement

    You must restart the computer after you apply this update.

    Update replacement information

    This update does not replace a previously released update.

    Third-party information disclaimer

    The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

    Source: https://support.microsoft.com/en-us/...ctre-variant-2

    Direct download link for KB4078407 EXE file from Microsoft Update Catalog:

    Download KB4078407 MSU for Windows 10,Windows 10 LTSB,Windows Server 2016 - 24 KB
    Last edited by Brink; 27 Apr 2018 at 11:21.
      My ComputersSystem Spec

  2. VBF's Avatar
    Posts : 474
    Win 10 Pro

    Got to this thread courtesy of @ddelo from Cumulative Update KB4093105 Windows 10 v1709 Build 16299.402 - Apr. 23 - Page 13 - Windows 10 Forums

    Basically this update KB4078407 didn't work on my Tosh laptop (details in the above thread if anyone is interested)
    I notice it's NOT an MS Update Standalone Package - just a 25K exe file.

    I tried installing it, ran Gibson's InSpectre - still not protected.

    I then tried installing KB4090007 and then running KB4078407. Still no go.

    This site Microsoft Releases Two New Windows Updates Containing New Spectre 2 Mitigations led me to KB4091666.

    This IS a MS Update Standalone Package but sadly wouldn't even install giving me this message

    Click image for larger version. 

Name:	Tosh - KB4091666 - Not applicable.JPG 
Views:	95 
Size:	18.3 KB 
ID:	186420

    Back to the drawing board
      My ComputersSystem Spec

  3. Pendaws's Avatar
    Posts : 324
    Windows 10 Pro 64bit 1809 (17763.55)

    I tried the update KB4093112 that is for the Spectre VII and it won't install on my AMD 6 core machine :O
    Originally AMD CPUs were not supposed to be affected but I got the GRC InSpectre.exe and ran it but still my system is vulnerable.
    Oh well.
    Attached Thumbnails Attached Thumbnails GRC.jpg  
      My ComputerSystem Spec

  4. Posts : 295
    Windows 10 Pro x64

    After applied the update;

    FeatureSettingOverride 0

    FeatureSettingOverrideMask 2
      My ComputerSystem Spec

  5. Ground Sloth's Avatar
    Posts : 255
    Windows 10

    This update does not provide protection against Spectre Variant 2. All it does is turn on protection if you had previously disabled it because of a bad BIOS update.
      My ComputerSystem Spec


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Hello All, Let me just start by saying that this is not the first time I attempt to mess with registries, system files, and I have a pretty firm grasp on what I'm doing. However, I couldn't find a single place that gave me any relevant...
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