WN22-00-000460 Windows Server 2022 systems must have Unified Extensible Firmware Interface (UEFI) firmware and be configured to run in UEFI mode, not Legacy BIOS.
All changes in this version
Maps to CM-6 via CCI-000366
Title
Windows Server 2022 systems must have Unified Extensible Firmware Interface (UEFI) firmware and be configured to run in UEFI mode, not Legacy BIOS.
Control
Devices that have UEFI firmware must run in "UEFI" mode. Verify the system firmware is configured to run in "UEFI" mode, not "Legacy BIOS". Run "System Information". Under "System Summary", if "BIOS Mode" does not display "UEFI", this is a finding.
Discussion
UEFI provides additional security features in comparison to legacy BIOS firmware, including Secure Boot. UEFI is required to support additional security features in Windows, including Virtualization Based Security and Credential Guard. Systems with UEFI that are operating in "Legacy BIOS" mode will not support these security features.
Related controls
CCI-000366
Fix
Configure UEFI firmware to run in "UEFI" mode, not "Legacy BIOS" mode.