In my case, rebooting the host server twice triggered the virtual machines to go into a saved state. The patch description notes that, “If you have Windows Defender Credential Guard (Virtual Secure Mode) enabled, your device will restart two times.” While that doesn’t sound like much of a known issue, I found that having a server with HyperV enabled affected the integrity of my virtual machines. Key changes affect “Windows devices that Unified Extensible Firmware Interface (UEFI) based firmware that can run with Secure Boot enabled.” The Secure Boot Forbidden Signature Database (DBX) prevents malicious UEFI modules from loading this update adds additional modules to block malicious attackers who could successfully exploit the vulnerability, bypass secure boot, and load untrusted software. These include Windows Server 2012 圆4-bit Windows Server 2012 R2 圆4-bit Windows 8.1 圆4-bit Windows Server 2016 圆4-bit Windows Server 2019 圆4-bit Windows 10, version 1607 圆4-bit Windows 10 version 1803 圆4-bit Windows 10, version 1809 圆4-bit and Windows 10, version 1909 圆4-bit. KB4535680, also known as Security update for Secure Boot DBX: January 12, 2021, makes improvements to Secure Boot DBX for a number of supported Windows versions. 12, and I want to warn you about one specific update that is affecting HyperV servers and some consumer level workstations. You can get more information by clicking the links to visit the relevant pages on the vendors website.I’m not ready to give an all-clear to the security patches released Jan. The links provided point to pages on the vendors websites. The information is provided 'As Is' without warranty of any kind.

Windows 10 Enterprise for Virtual Desktops (圆4)ĭisclaimer: This webpage is intended to provide you information about patch announcement for certain specific software products. The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.Īffected Product Information Product Name Security Update for Windows Server, version 1909 based Systems (KB4535680) Security Update for Windows 10 Version 1909 for 圆4-based Systems (KB4535680)

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