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

The ALG providing content filtering must continuously monitor inbound communications traffic crossing internal security boundaries for unusual or unauthorized activities or conditions.

DISA Rule

SV-205016r831392_rule

Vulnerability Number

V-205016

Group Title

SRG-NET-000390

Rule Version

SRG-NET-000390-ALG-000139

Severity

CAT II

CCI(s)

• CCI-002661 - Monitor inbound communications traffic per organization-defined frequency for organization-defined unusual or unauthorized activities or conditions.

Weight

10

Fix Recommendation

If the ALG performs content filtering as part of the traffic management functionality, configure the ALG to continuously monitor inbound communications traffic for unusual or unauthorized activities or conditions.

Check Contents

If the ALG does not perform content filtering as part of the traffic management functions, this is not applicable.

Verify the ALG continuously monitors inbound communications traffic for unusual or unauthorized activities or conditions.

If the ALG does not continuously monitor inbound communications traffic for unusual or unauthorized activities or conditions, this is a finding.

Vulnerability Number

V-205016

Documentable

False

Rule Version

SRG-NET-000390-ALG-000139

Severity Override Guidance

If the ALG does not perform content filtering as part of the traffic management functions, this is not applicable.

Verify the ALG continuously monitors inbound communications traffic for unusual or unauthorized activities or conditions.

If the ALG does not continuously monitor inbound communications traffic for unusual or unauthorized activities or conditions, this is a finding.

Check Content Reference

M

Target Key

2904