June 11, 2019—KB4503286 (OS Build 17134.829)

የሚተገበረው ለ፦ Windows 10, version 1803

Improvements and fixes


This update includes quality improvements. Key changes include:

  • Addresses a security vulnerability by intentionally preventing connections between Windows and Bluetooth devices that are not secure and use well-known keys to encrypt connections, including security fobs. If BTHUSB Event 22 in the Event Viewer states, “Your Bluetooth device attempted to establish a debug connection….”, then your system is affected. Contact your Bluetooth device manufacturer to determine if a device update exists. For more information, see CVE-2019-2102 and KB4507623.
  • Addresses an issue that may prevent the Preboot Execution Environment (PXE) from starting a device from a Windows Deployment Services (WDS) server configured to use Variable Window Extension. This may cause the connection to the WDS server to terminate prematurely while downloading the image. This issue does not affect clients or devices that are not using Variable Window Extension.
  • Addresses an issue that may prevent Internet Explorer 11 from opening if the Default Search Provider is not set or is malformed.
  • Security updates to Microsoft Scripting Engine, Internet Explorer, Microsoft Edge, Windows App Platform and Frameworks, Windows App Platform and Frameworks, Windows Input and Composition, Windows Media, Windows Shell, Windows Server, Windows Authentication, Windows Cryptography, Windows Storage and Filesystems, Windows Virtualization, Internet Information Services Windows SQL components, and the Microsoft JET Database Engine .

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.

Known issues in this update


Symptom Workaround
Certain operations, such as rename, that you perform on files or folders that are on a Cluster Shared Volume (CSV) may fail with the error, “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs when you perform the operation on a CSV owner node from a process that doesn’t have administrator privilege.

Do one of the following:

  • Perform the operation from a process that has administrator privilege.
  • Perform the operation from a node that doesn’t have CSV ownership.
Microsoft is working on a resolution and will provide an update in an upcoming release.
When trying to expand, view, or create Custom Views in Event Viewer, you may receive the error, "MMC has detected an error in a snap-in and will unload it." and the app may stop responding or close. You may also receive the same error when using Filter Current Log in the Action menu with built-in views or logs. Built-in views and other features of Event Viewer should work as expected.

This issue is resolved in KB4503288.

We are investigating reports that a small number of devices may startup to a black screen during the first logon after installing updates.

To mitigate this issue, press Ctrl+Alt+Delete, then select the Power button in the lower right corner of the screen and select Restart. Your device should now restart normally.

We are working on a resolution and will provide an update in an upcoming release.

Devices may have issues connecting to some Storage Area Network (SAN) devices using Internet Small Computer System Interface (iSCSI) after installing this update. You may also receive an error in the System log section of Event Viewer with Event ID 43 from iScsiPrt and a description of “Target failed to respond in time for a login request.” This issue is resolved in KB4509478.
Devices that start up using Preboot Execution Environment (PXE) images from Windows Deployment Services (WDS) or System Center Configuration Manager (SCCM) may fail to start with the error "Status: 0xc0000001, Info: A required device isn't connected or can't be accessed" after installing this update on a WDS server.

This issue is resolved in KB4512509.

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. For more information, see Servicing stack updates.

If you are using Windows Update, the latest SSU (KB4497398) 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

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.

File information

For a list of the files that are provided in this update, download the file information for cumulative update 4503286