None **IMPORTANT **Verify that you have installed the required updates listed in the **How to get this update** section _before_ installing this update. For information about the various types of Windows updates, such as critical, security, driver, service packs, and so on, please see the following [article](<https://support.microsoft.com/help/824684>). To view other notes and messages, see the Windows 7 SP1 and Windows Server 2008 R2 SP1 update history [home page](<https://support.microsoft.com/help/4009469>). ## Improvements and fixes This security update includes quality improvements. Key changes include: * Security updates to Windows Graphics, Windows Peripherals, Windows Storage and Filesystems, and Windows File Server and Clustering. For more information about the resolved security vulnerabilities, please refer to the new [Security Update Guide](<https://msrc.microsoft.com/update-guide>) website. ## Known issues in this update **Symptom**| **Workaround** ---|--- After installing this update and restarting your device, you might receive the error, “Failure to configure Windows updates. Reverting Changes. Do not turn off your computer,” and the update might show as **Failed** in **Update History**.| This is expected in the following circumstances: * If you are installing this update on a device that is running an edition that is not supported for ESU. For a complete list of which editions are supported, see [KB4497181](<https://support.microsoft.com/help/4497181>). * If you do not have an ESU MAK add-on key installed and activated. If you have purchased an ESU key and have encountered this issue, please verify you have applied all prerequisites and that your key is activated. For information on activation, please see this [blog](<https://aka.ms/Windows7ESU>) post. For information on the prerequisites, see the "How to get this update" section of this article. 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. ## How to get this update **Before installing this update****IMPORTANT** Customers who have purchased the Extended Security Update (ESU) for on-premises versions of these operating systems must follow the procedures in [KB4522133](<https://support.microsoft.com/help/4522133>) to continue receiving security updates after extended support ends. Extended support ends as follows: * For Windows 7 Service Pack 1 and Windows Server 2008 R2 Service Pack 1, extended support ends on January 14, 2020. * For Windows Embedded Standard 7, extended support ends on October 13, 2020. For more information about ESU and which editions are supported, see [KB4497181](<https://support.microsoft.com/help/4497181>).**Note** For Windows Embedded Standard 7, Windows Management Instrumentation (WMI) must be enabled to get updates from Windows Update or Windows Server Update Services.**Prerequisite:**You must install the updates listed below and **_restart your device_** before installing the latest Rollup. Installing these updates improves the reliability of the update process and mitigates potential issues while installing the Rollup and applying Microsoft security fixes. 1. The March 12, 2019 servicing stack update (SSU) ([KB4490628](<https://support.microsoft.com/help/4490628>)). To get the standalone package for this SSU, search for it in the [Microsoft Update Catalog](<http://www.catalog.update.microsoft.com/home.aspx>). This update is required to install updates that are only SHA-2 signed. 2. The latest SHA-2 update ([KB4474419](<https://support.microsoft.com/help/4474419>)) released September 10, 2019. If you are using Windows Update, the latest SHA-2 update will be offered to you automatically. This update is required to install updates that are only SHA-2 signed. For more information on SHA-2 updates, see [2019 SHA-2 Code Signing Support requirement for Windows and WSUS](<https://support.microsoft.com/help/4472027>). 3. For Windows Thin PC, you must have the August 11, 2020 SSU ([KB4570673](<https://support.microsoft.com/help/4570673>)) or a later SSU installed to make sure you continue to get the extended security updates starting with the October 13, 2020 updates. 4. To get this security update, you must reinstall the "Extended Security Updates (ESU) Licensing Preparation Package" ([KB4538483](<https://support.microsoft.com/help/4538483>)) or the "Update for the Extended Security Updates (ESU) Licensing Preparation Package" ([KB4575903](<https://support.microsoft.com/help/4575903>)) even if you previously installed the ESU key. The ESU licensing preparation package will be offered to you from WSUS. To get the standalone package for ESU licensing preparation package, search for it in the [Microsoft Update Catalog](<http://www.catalog.update.microsoft.com/home.aspx>). After installing the items above, Microsoft strongly recommends that you install the _latest_ SSU ([KB4592510](<https://support.microsoft.com/help/4592510>)). If you are using Windows Update, the latest SSU will be offered to you automatically if you are an ESU customer. To get the standalone package for the latest SSU, search for it in the [Microsoft Update Catalog](<http://www.catalog.update.microsoft.com/home.aspx>). For general information about SSUs, see [Servicing stack updates](<https://docs.microsoft.com/en-us/windows/deployment/update/servicing-stack-updates>) and [Servicing Stack Updates (SSU): Frequently Asked Questions](<https://support.microsoft.com/help/4535697>). **REMINDER** If you are using Security-only updates, you will also need to install all previous Security-only updates and the latest cumulative update for Internet Explorer ([KB4586768](<https://support.microsoft.com/help/4586768>)). **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](<https://www.catalog.update.microsoft.com/Search.aspx?q=KB4592503>) website. Windows Server Update Services (WSUS)| Yes| This update will automatically sync with WSUS if you configure **Products and Classifications** as follows:**Product**: Windows 7 Service Pack 1, Windows Server 2008 R2 Service Pack 1, Windows Embedded Standard 7 Service Pack 1, Windows Embedded POSReady 7, Windows Thin PC**Classification**: Security Updates **File information**For a list of the files that are provided in this update, download the [file information for cumulative update 4592503](<https://download.microsoft.com/download/6/a/9/6a9abff1-e04b-45dd-970c-bac930fa86f0/4592503.csv>).
Microsoft Windows SMB Server Information Disclosure (CVE-2020-17140)
KB4592495: Windows 8.1 and Windows Server 2012 R2 December 2020 Security Update
KB4592503: Windows 7 and Windows Server 2008 R2 December 2020 Security Update
KB4593226: Windows 10 Version 1607 and Windows Server 2016 December 2020 Security Update
KB4592449: Windows 10 Version 1903 and Windows 10 Version 1909 December 2020 Security Update
KB4592440: Windows 10 Version 1809 and Windows Server 2019 December 2020 Security Update
Patch Tuesday - December 2020