Cumulative Update KB4517389 Windows 10 v1903 build 18362.418 - Oct. 8 Win Update

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    Cumulative Update KB4517389 Windows 10 v1903 build 18362.418 - Oct. 8

    Cumulative Update KB4517389 Windows 10 v1903 build 18362.418 - Oct. 8

    Category: Win Update
    Last Updated: 13 Nov 2019 at 16:38

    UPDATE 10/24: Cumulative Update KB4522355 Windows 10 v1903 build 18362.449 - Oct. 24

    October 8, 2019 - KB4517389 (OS Build 18362.418)

    Applies to: Windows 10 version 1903, Windows Server version 1903

    Note Follow @WindowsUpdate to find out when new content is published to the release information dashboard.

    Note This release also contains updates for Microsoft HoloLens (OS Build 18362.1034) released October 8, 2019. Microsoft will release an update directly to the Windows Update Client to improve Windows Update reliability on Microsoft HoloLens that have not updated to this most recent OS Build.

    ePub support ending in Microsoft Edge
    Microsoft Edge will end support for e-books that use the .epub file extension over the next several months. For more information, see Download an ePub app to keep reading e-books.

    For more information about the various types of Windows updates, such as critical, security, driver, service packs, and so on, please see the following article.


    • Updates to improve security when using Internet Explorer and Microsoft Edge.
    • Updates for verifying user names and passwords.
    • Updates for storing and managing files.

    Improvements and fixes

    This security update includes quality improvements. Key changes include:

    • Addresses an issue in security bulletin CVE-2019-1318 that may cause client or server computers that don’t support Extended Master Secret (EMS) RFC 7627 to have increased connection latency and CPU utilization. This issue occurs while performing full Transport Layer Security (TLS) handshakes from devices that don’t support EMS, especially on servers. EMS support has been available for all the supported versions of Windows since calendar year 2015 and is being incrementally enforced by the installation of the October 8, 2019 and later monthly updates.
    • Addresses an issue with applications and printer drivers that utilize the Windows JavaScript engine (jscript.dll) for processing print jobs.
    • Security updates to Windows Shell, Internet Explorer, Microsoft Edge, Windows App Platform and Frameworks, Windows Cryptography, Windows Authentication, Windows Storage and Filesystems, Windows Kernel, Microsoft Scripting Engine, and Windows Server.

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

    For more information about the resolved security vulnerabilities, please refer to the Security Update Guide.

    Windows Update Improvements
    Microsoft has released an update directly to the Windows Update client to improve reliability. Any device running Windows 10 configured to receive updates automatically from Windows Update, including Enterprise and Pro editions, will be offered the latest Windows 10 feature update based on device compatibility and Windows Update for Business deferral policy. This doesn't apply to long-term servicing editions.

    Known issues in this update

    Symptom Workaround
    When setting up a new Windows device during the Out of Box Experience (OOBE), you might be unable to create a local user when using Input Method Editor (IME). This issue might affect you if you are using the IME for Chinese, Japanese, or Korean languages.

    Note This issue does not affect using a Microsoft Account during OOBE.
    To mitigate this issue, set the keyboard language to English during user creation or use a Microsoft Account to complete OOBE. You can set the keyboard language back to your preferred language after user creation. Once the OOBE is done and you are at the desktop, you can rename the current user using these instructions. If you prefer to create a new local user, see KB4026923.

    Microsoft is working on a resolution and will provide an update in an upcoming release.
    Updates for Windows released October 8, 2019 or later provide protections, tracked by CVE-2019-1318, against an attack that could allow unauthorized access to information or data within TLS connections. This type of attack is known as a man-in-the-middle exploit. Windows might fail to connect to TLS clients and servers that do not support Extended Master Secret for resumption (RFC 7627). Lack of RFC support might cause one or more of the following errors or logged events:

    • "The request was aborted: Could not create SSL/TLS secure Channel"

    • SCHANNEL event 36887 is logged in the System event log with the description, "A fatal alert was received from the remote endpoint. The TLS protocol defined fatal alert code is 20.​"
    For information, see KB4528489.

    How to get this update

    Before installing this update

    Microsoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU and applying Microsoft security fixes. For more information, see Servicing stack updates.

    If you are using Windows Update, the latest SSU (KB4521863) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.

    Install this update

    Release Channel Available Next Step
    Windows Update and Microsoft Update Yes None. This update will be downloaded and installed automatically from Windows Update.
    Microsoft Update Catalog Yes To get the standalone package for this update, go to the Microsoft Update Catalog website.
    Windows Server Update Services (WSUS) Yes This update will automatically synchronize with WSUS if you configure Products and Classifications as follows:
    Product: Windows 10, version 1903 and later
    Classification: Security Updates
    File information

    For a list of the files that are provided in this update, download the file information for cumulative update 4517389.


    See also: Compatibility update KB4517388 for installing Windows 10 v1903 Oct. 8

    Direct download links for KB4517389 MSU file from Microsoft Update Catalog:

    Download KB4517389 MSU for Windows 10 v1903 32-bit (x86) - 153.1 MB

    Download KB4517389 MSU for Windows 10 v1903 64-bit (x64) - 313.2 MB

    Download KB4517389 MSU for Windows 10 v1903 ARM64 - 343.1 MB

    How to Find Windows 10 Version Number

    How to Find Windows 10 Build Number

    Known and Resolved issues for Windows 10 version 1903

    Brink's Avatar Posted By: Brink
    08 Oct 2019

  1. Posts : 1,562
    Windows 10 HOME 64-BIT

    But where is the 1909? I'm installing the update now but I ain't got the 1909 update. But where can I download it?
      My Computer

  2. Posts : 469
    Windows 10 Pro 20H2 x64

    Downloading this + Malicious Software Removal Tool.
      My Computers

  3. Posts : 24,494
    10 Home x64 (21H2) (10 Pro on 2nd pc)

    After not issuing one for September, there's also a new MSRT for October.

    Cumulative Update KB4517389 Windows 10 v1903 build 18362.418 - Oct. 8-image.png
      My Computers

  4. Posts : 2,557
    Windows 10 pro x64-bit

    Installing it at 11%.
      My Computers

  5. Posts : 46,457
    Windows 10 Home 64bit 21H1 and insider builds

    Downloading here and on 1909 in RP ring too.
      My Computer

  6. Posts : 61,471
    64-bit Windows 11 Pro for Workstations
    Thread Starter

    Cumulative Update KB4517389 Windows 10 v1903 build 18362.418 - Oct. 8-kb4517389.png
      My Computers

  7. Posts : 401
    Windows 10 Pro 64 bit

    RingTailCoon said:
    But where is the 1909? I'm installing the update now but I ain't got the 1909 update. But where can I download it?
    1909 has not been "officially" released yet. There was speculation that it may release today, but that doesn't seem to be the case.

    Quick and uneventful download and install so far. Will post back if I find anything worthy of reporting.

      My Computers

  8. Posts : 46,457
    Windows 10 Home 64bit 21H1 and insider builds

    Seems to be an SSU too. Double install.
      My Computer

  9. Posts : 3,297
    Windows 10 Pro x64

    All done and dusted. I was hoping for 19H2 today, but it's missing.
      My Computer


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