STIGQter: STIG Summary: Microsoft Windows Server 2025 Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 01 Jul 2026:

Windows Server 2025 User Account Control (UAC) must virtualize file and registry write failures to per-user locations.

DISA Rule

SV-278239r1182205_rule

Vulnerability Number

V-278239

Group Title

SRG-OS-000134-GPOS-00068

Rule Version

WN25-SO-000450

Severity

CAT II

CCI(s)

• CCI-001084 - Isolate security functions from nonsecurity functions.

Weight

10

Fix Recommendation

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> User Account Control: Virtualize file and registry write failures to per-user locations to "Enabled".

Check Contents

UAC requirements are not applicable for Server Core installations (this is the default installation option for Windows Server 2025 versus Server with Desktop Experience).

If the following registry value does not exist or is not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\

Value Name: EnableVirtualization

Value Type: REG_DWORD
Value: 0x00000001 (1)

Vulnerability Number

V-278239

Documentable

False

Rule Version

WN25-SO-000450

Severity Override Guidance

UAC requirements are not applicable for Server Core installations (this is the default installation option for Windows Server 2025 versus Server with Desktop Experience).

If the following registry value does not exist or is not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\

Value Name: EnableVirtualization

Value Type: REG_DWORD
Value: 0x00000001 (1)

Check Content Reference

M

Target Key

5719