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WN11-00-000015 Windows 11 systems must have Unified Extensible Firmware Interface (UEFI) firmware and be configured to run in UEFI mode, not Legacy BIOS.

DISA STIG library V2R11
All changes in this version
first version loaded CAT II

Maps to SC-8(1) via CCI-002421

Title

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

Control

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 11, 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-002421

Fix

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