Windows Server 2022 systems must have Unified Extensible Firmware Interface (UEFI) firmware and be configured to run in UEFI mode, not Legacy BIOS.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-254283	WN22-00-000460	SV-254283r991589_rule		Medium

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, including Virtualization Based Security and Credential Guard. Systems with UEFI that are operating in "Legacy BIOS" mode will not support these security features.

STIG	Date
Microsoft Windows Server 2022 Security Technical Implementation Guide	2025-05-15

Details

Check Text (C-57768r848663_chk)

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.

Fix Text (F-57719r848664_fix)

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