STIGQter STIGQter: STIG Summary: Microsoft Windows Server Domain Name System (DNS) Security Technical Implementation Guide Version: 2 Release: 5 Benchmark Date: 01 Jul 2026:

In a split DNS configuration, where separate name servers are used between the external and internal networks, the internal name server must be configured to not be reachable from outside resolvers.

DISA Rule

SV-259416r961863_rule

Vulnerability Number

V-259416

Group Title

SRG-APP-000516-DNS-000093

Rule Version

WDNS-22-000119

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure the internal DNS server's firewall policy, or the network firewall, to block queries from external hosts.

Check Contents

Consult with the system administrator to review the internal Windows DNS Server's firewall policy.

The inbound TCP and UDP ports 53 rule should be configured to only allow hosts from the internal network to query the internal DNS server.

If the firewall policy is not configured with the restriction, consult with the network firewall administrator to confirm the restriction on the network firewall.

If neither the DNS server's firewall policy nor the network firewall is configured to block external hosts from querying the internal DNS server, this is a finding.

Vulnerability Number

V-259416

Documentable

False

Rule Version

WDNS-22-000119

Severity Override Guidance

Consult with the system administrator to review the internal Windows DNS Server's firewall policy.

The inbound TCP and UDP ports 53 rule should be configured to only allow hosts from the internal network to query the internal DNS server.

If the firewall policy is not configured with the restriction, consult with the network firewall administrator to confirm the restriction on the network firewall.

If neither the DNS server's firewall policy nor the network firewall is configured to block external hosts from querying the internal DNS server, this is a finding.

Check Content Reference

M

Target Key

5576