Windows Server 2025 Internet Protocol version 6 (IPv6) source routing must be configured to the highest protection level to prevent IP source routing.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-278082	WN25-CC-000030	SV-278082r1180952_rule	CCI-000366	low
Description
Configuring the system to disable IPv6 source routing protects against spoofing.
STIG			Date
Microsoft Windows Server 2025 Security Technical Implementation Guide			2026-02-20

Related Frameworks

4 paths across 3 frameworks

NIST 800-531 mapping

CM-6

1.00

DISA · V1R1 · disa_xccdf · related
DISA · 2025-01-23 · disa_cci_list · equivalent

NIST 800-1712 mappings

3.4.1

1.00

DISA · V1R1 · disa_xccdf · related
DISA · 2025-01-23 · disa_cci_list · equivalent
NIST · Rev 2 (Feb 2020, errata Jan 2021) · nist_800_171_app_d · equivalent

3.4.2

1.00

DISA · V1R1 · disa_xccdf · related
DISA · 2025-01-23 · disa_cci_list · equivalent
NIST · Rev 2 (Feb 2020, errata Jan 2021) · nist_800_171_app_d · equivalent

CCI1 mapping

CCI-000366

1.00

DISA · V1R1 · disa_xccdf · related

Details

Check Text (C-278082r1180952_chk)

Verify the registry value below: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\ Value Name: DisableIPSourceRouting Type: REG_DWORD Value: 0x00000002 (2) If the registry value does not exist or is not configured as specified, this is a finding.

Fix Text (F-82517r1180951_fix)

Configure the policy value for Computer Configuration >> Administrative Templates >> MSS (Legacy) >> MSS: (DisableIPSourceRouting IPv6) IP source routing protection level (protects against packet spoofing) to "Enabled" with "Highest protection, source routing is completely disabled" selected. This policy setting requires the installation of the MSS-Legacy custom templates included with the STIG package. "MSS-Legacy.admx" and "MSS-Legacy.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.