October 18, 2018—KB4462939 (OS Build 15063.1418)

Applies to: Windows 10 Version 1703

Improvements and fixes


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

  • Addresses an issue that causes high CPU usage that results in performance degradation on some systems with Family 15h and 16h AMD processors. This issue occurs after installing the June 2018 or July 2018 Windows updates from Microsoft and the AMD microcode updates that address Spectre Variant 2 (CVE-2017-5715 – Branch Target Injection).
  • Addresses the redenomination of local currency that the Central Bank of Venezuela implemented to enter the Bolivar Soberano into circulation.
  • Addresses additional issues with updated time zone information.
  • Addresses an issue that may cause the operating system to stop responding when transitioning from Sleep to Hibernation.
  • Addresses an issue with navigation from the Decade view in the Japanese calendar. When the user tries to go from the Current era to the next era, navigation does not work properly.
  • Addresses an issue with cloud authentication performance for accounts that create logon sessions very quickly.
  • Addresses an issue that makes it impossible to disable TLS 1.0 and TLS 1.1 when the Federal Information Processing Standard (FIPS) mode is enabled.
  • Addresses an issue in which applications on systems with more than 4 GB of memory receive Access Denied error code “0x5” when calling CreateProcessWithLogonW().
  • Addresses an issue in which applications have handle leaks when using client authentication certificates with the TLS protocol. This issue occurs when the FreeCredentialsHandle call occurs before the DeleteSecurityContext call in application code.
  • Addresses an issue that can cause App-V packages to fail because of a missing file or DLL error.
  • Addresses an issue in which the System.Security.Cryptography.Algorithms reference was not correctly loaded on .NET Framework 4.7.1 after the July 10, 2018 and August 14, 2018 patches.
  • Addresses an issue that may cause the system to stop working during the shutdown of some Windows Presentation Foundation (WPF) apps because of TaskCanceledException. Apps that are vulnerable to this issue perform work involving weak events or data binding after the Application.Run() function returns values.
  • Addresses a race condition in temporary files and some antivirus scanners that causes .NET Framework applications to stop working. The error message is, "The process cannot access the file <name of temp file>".
  • Updates the .NET Framework's support for the formatting of Japanese dates for the first year in the eras. When the format pattern is “y年”, the year format will use the symbol 元 and not use year number 1. Additionally, the .NET Framework will support dates that include 元.
  • Updates Venezuela currency information. This will affect the culture of “es-VE” as follows:
    • The currency symbol is “Bs.S”.
    • The English currency name is “Bolívar Soberano”.
    • The local currency name is “bolívar soberano”.
    • The International Currency Code is “VES”.
  • Addresses an issue with a dialog box that may appear with a non-applicable message beginning with the words, “Hosted by...” when first starting Microsoft Edge. The dialog box only appears if you have turned on “Block only third-party cookies” in Microsoft Edge and applied certain language packs after installing the October 9, 2018 update.

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

After you install the August Preview of Quality Rollup or September 11, 2018 .NET Framework update, instantiation of SqlConnection can throw an exception. For more information about this issue, see the following article in the Microsoft Knowledge Base:

4470809 SqlConnection instantiation exception on .NET 4.6 and later after August-September 2018 .NET Framework updates

This issue is resolved in KB4480959.
After installing this update, users may not be able to use the Seek Bar in Windows Media Player when playing specific files. This issue does not affect normal playback. This issue is resolved in KB4471327.

How to get this update


Before installing this update

Windows cumulative updates require that you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). This helps to mitigate potential issues while installing the LCU. For more information, see Servicing stack updates.

If you are using Windows Update, the latest SSU (KB4132649) will be offered to you automatically. To get the stand-alone package for the latest SSU, go to the Microsoft Update Catalog.

Install this update

To download and install this update, go to Settings > Update & Security > Windows Update and select Check for updates.

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

File information

For a list of the files that are provided in this update, download the file information for cumulative update 4462939.