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

Windows Server 2025 must have the Server Message Block (SMB) v1 protocol disabled on the SMB client.

DISA Rule

SV-278025r1182038_rule

Vulnerability Number

V-278025

Group Title

SRG-OS-000095-GPOS-00049

Rule Version

WN25-00-000400

Severity

CAT II

CCI(s)

• CCI-000381 - Configure the system to provide only organization-defined mission essential capabilities.

Weight

10

Fix Recommendation

Configure the policy value for Computer Configuration >> Administrative Templates >> MS Security Guide >> Configure SMBv1 client driver to "Enabled" with "Disable driver (recommended)" selected for "Configure MrxSmb10 driver".

Restart the system for the changes to take effect.

This policy setting requires the installation of the SecGuide custom templates included with the STIG package. "SecGuide.admx" and "SecGuide.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.

Check Contents

Different methods are available to disable SMBv1 on Windows Server 2025, if WN25-00-000380 is configured, this is not applicable.

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

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \SYSTEM\CurrentControlSet\Services\mrxsmb10\

Value Name: Start

Type: REG_DWORD
Value: 0x00000004 (4)

Vulnerability Number

V-278025

Documentable

False

Rule Version

WN25-00-000400

Severity Override Guidance

Different methods are available to disable SMBv1 on Windows Server 2025, if WN25-00-000380 is configured, this is not applicable.

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

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \SYSTEM\CurrentControlSet\Services\mrxsmb10\

Value Name: Start

Type: REG_DWORD
Value: 0x00000004 (4)

Check Content Reference

M

Target Key

5719