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V-278031

CAT II (Medium)

Windows Server 2025 systems must have Unified Extensible Firmware Interface (UEFI) firmware and be configured to run in UEFI mode, not Legacy BIOS.

Rule ID

SV-278031r1182046_rule

STIG

Microsoft Windows Server 2025 Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-000366

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.

Check Content

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

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