STIGQter: STIG Summary: Application Layer Gateway Security Requirements Guide Version: 2 Release: 4 Benchmark Date: 01 Jul 2026:

The ALG must deny network communications traffic by default and allow network communications traffic by exception (i.e., deny all, permit by exception).

DISA Rule

SV-204954r1137551_rule

Vulnerability Number

V-204954

Group Title

SRG-NET-000202

Rule Version

SRG-NET-000202-ALG-000124

Severity

CAT II

CCI(s)

• CCI-001109 - Deny network communications traffic by default and allow network communications traffic by exception at managed interfaces; and/or for organization-defined systems.

Weight

10

Fix Recommendation

Configure the ALG to deny network communications traffic by default and allow network communications traffic by exception on both inbound and outbound interfaces.

Check Contents

Verify the ALG denies network communications traffic by default and allows network communications traffic by exception on both inbound and outbound interfaces.

If the ALG does not deny network communications traffic by default and allow network communications traffic by exception on both inbound and outbound interfaces, this is a finding.

Vulnerability Number

V-204954

Documentable

False

Rule Version

SRG-NET-000202-ALG-000124

Severity Override Guidance

Verify the ALG denies network communications traffic by default and allows network communications traffic by exception on both inbound and outbound interfaces.

If the ALG does not deny network communications traffic by default and allow network communications traffic by exception on both inbound and outbound interfaces, this is a finding.

Check Content Reference

M

Target Key

2904