Microsoft Windows 11

Windows 11 systems must have Unified Extensible Firmware Interface (UEFI) firmware and be configured to run in UEFI mode, not Legacy BIOS

STIG ID: WN11-00-000015 | SRG: SRG-OS-000424-GPOS-00188 | Severity: Medium | CCI: CCI-002421 | Vulnerability ID: V-253256

Description

UEFI provides additional security features in comparison to legacy BIOS firmware, including Secure Boot. UEFI is required to support additional security features in Windows 11, including virtualization-based Security and Credential Guard. Systems with UEFI that are operating in Legacy BIOS mode will not support these security features.

Check

C-253256r971547_chk

For virtual desktop implementations (VDIs) where the virtual desktop instance is deleted or refreshed upon logoff, this is NA.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.

Fix

F-56659r828851_fix

Configure UEFI firmware to run in UEFI mode, not Legacy BIOS mode.