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This security update includes quality improvements. Key changes include:
For more information about the resolved security vulnerabilities, please refer to the Security Update Guide.
| Symptom | Workaround |
| 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 KB4512499. |
| After installing this update, applications that were made using Visual Basic 6 (VB6), macros using Visual Basic for Applications (VBA), and scripts or apps using Visual Basic Scripting Edition (VBScript) may stop responding and you may receive an "invalid procedure call error." | This issue is resolved in KB4517301, which is an optional update. It is now available on Microsoft Update Catalog and Windows Server Update Services (WSUS). |
Before installing this update
Microsoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest Rollup. SSUs improve the reliability of the update process to mitigate potential issues while installing the Rollup and applying Microsoft security fixes.
If you are using Windows Update, the latest SSU (KB4493730) 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 | No | See the other options below. |
| Microsoft Update Catalog | Yes | To get the standalone package for this update, go to the Microsoft Update Catalog. |
| Windows Server Update Services (WSUS) | Yes |
This update will automatically synchronize with WSUS if you configure Products and Classifications as follows: Product: Windows Server 2008 Service Pack 2 Classification: Security Updates |
File information
For a list of the files that are provided in this update, download the file information for update 4512491.
Keywords: windows server 2008 sp2, Vulnerabilities/exploits/security bulletins, kbContentAuto, kbSupportTopic