July 9, 2019—KB4507449 (Monthly Rollup)

Starting with KB4493472 Monthly Rollup updates will no longer include PciClearStaleCache.exe. This installation utility addressees inconsistencies in the internal PCI cache. This can cause the symptoms listed below when installing monthly updates that do NOT include PciClearStaleCache:These symptoms are especially common on guest virtual machines and on machines which have not been updated since March, 2018.Administrators should ensure that any one or more of the Monthly rollups released between April 10, 2018 (KB4093118) and March 12, 2019 (KB4489878) have been installed prior to installing April 2019 and later updates. Each of these rollup updates includes PciClearStaleCache.exe.

• Existing NIC definitions in control panel networks may be replaced with a new Ethernet Network Interface Card (NIC) but with default settings. Any custom settings on the previously NIC persist in the registry but were unused.
• Static IP address settings were lost on network interfaces.
• Wi-Fi profile settings were not displayed in the network flyout.
• WIFI network adapters were disabled

**July 19, 2019 - IMPORTANT:**Beginning with the July 2019 updates, Active Directory domain controllers will intentionally block unconstrained delegation across forest, external, and quarantined trusts. Authentication requests for services that use unconstrained delegation over the listed trust types will fail when you request new tickets. Administrators should reconfigure the affected services to use resource-based constrained delegation. For more information, see KB4490425.

Improvements and fixes

This security update includes improvements and fixes that were a part of update KB4503277 (released June 20, 2019) and addresses the following issues:

• Provides protections against a variant (CVE-2019-1125) of the Spectre Variant 1 speculative execution side channel vulnerability.
• Security updates to Windows Server, Microsoft Graphics Component, Windows Storage and Filesystems, Windows Shell, Windows Input and Composition, and Windows Kernel.
  For more information about the resolved security vulnerabilities, please refer to the Security Update Guide.

Known issues in this update

• McAfee Security (ENS) Threat Prevention 10.x
• McAfee Host Intrusion Prevention (Host IPS) 8.0
• McAfee VirusScan Enterprise (VSE) 8.8
  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 KB4512514.

How to get this update