The ALG must only allow incoming communications from organization-defined authorized sources routed to organization-defined authorized destinations.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-205008	SRG-NET-000364-ALG-000122	SV-205008r831385_rule	CCI-002403	medium
Description
Unrestricted traffic may contain malicious traffic which poses a threat to an enclave or to other connected networks. Additionally, unrestricted traffic may transit a network, which uses bandwidth and other resources. Access control policies and access control lists implemented on devices that control the flow of network traffic (e.g., application level firewalls and Web content filters), ensure the flow of traffic is only allowed from authorized sources to authorized destinations. Networks with different levels of trust (e.g., the Internet or CDS) must be kept separate.
STIG			Date
Application Layer Gateway Security Requirements Guide			2025-09-15

Related Frameworks

1 mapping across 3 frameworks

SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (2) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

NET-03Boundary Protection

0.50

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)
SCF Secure Traceability Relationship Mapping (STRM)2026.2intersects

NET-04.1Deny Traffic by Default & Allow Traffic by Exception

0.50

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)
SCF Secure Traceability Relationship Mapping (STRM)2026.2intersects

NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (8) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CM-6Configuration Settings

1.00

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
DISA STIG Benchmark (XCCDF)3our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)3intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-24Fail in Known State

1.00

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
DISA STIG Benchmark (XCCDF)V1R2our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V1R2intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-47Alternate Communications Paths

1.00

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
DISA STIG Benchmark (XCCDF)V2R1our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V2R1intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-5Denial-of-service Protection

1.00

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
DISA STIG Benchmark (XCCDF)V2R1our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V2R1intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-7Boundary Protection

1.00

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
DISA STIG Benchmark (XCCDF)V1R2our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V1R2intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-7(11)Restrict Incoming Communications Traffic

1.00

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-7(29)Separate Subnets to Isolate Functions

1.00

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
DISA STIG Benchmark (XCCDF)V3R4our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V3R4intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-7(5)Deny by Default — Allow by Exception

1.00

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
DISA STIG Benchmark (XCCDF)V1R2our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V1R2intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

CCI1 mapping

CCI-002403

1.00

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)

Details

Check Text (C-205008r831385_chk)

Verify the ALG only allows incoming communications from organization-defined authorized sources routed to organization-defined authorized destinations. If the ALG allows incoming communications from unauthorized sources routed to unauthorized destinations, this is a finding.

Fix Text (F-5276r396398_fix)

Configure the ALG to only allow incoming communications from organization-defined authorized sources routed to organization-defined authorized destinations.