STIGQter: STIG Summary: Forescout Network Access Control Security Technical Implementation Guide Version: 2 Release: 5 Benchmark Date: 01 Jul 2026:

Forescout must deny network connection for endpoints that cannot be authenticated using an approved method. This is required for compliance with C2C Step 4.

DISA Rule

SV-233338r811427_rule

Vulnerability Number

V-233338

Group Title

SRG-NET-000148-NAC-000620

Rule Version

FORE-NC-000450

Severity

CAT II

CCI(s)

• CCI-000778 - Uniquely identify organization-defined devices and/or types of devices before establishing a local, remote, and/or network connection.

Weight

10

Fix Recommendation

Use the Forescout Administrator UI to configure a policy to deny network access using a control action for any endpoints that cannot be authenticated using an approved method as defined in the SSP.

1. Log on to Forescout UI.
2. From the Policy tab, select the Authentication and Authorization policy.
3. Find the 802.1x Authorization policy and click Edit.
4. From the Sub-Rules section, check that all of the options for authentication are selected including the following:
-Machine Authenticated
-User+Machine Authenticated
-User+Managed Machine
-User+NotMachine Authenticated

If these are all configured, check that the final step is not authorized by one of the previous steps, and block traffic in accordance with the SSP by selecting "Add>".

1. Give the policy a name like "Deny Access".
2. In the Condition box, click "Add" and select "802.1x RADIUS Authentication State".
3. Check the box labeled "RADIUS-Rejected", and then click "OK".
4. In the Actions box, click "Add" and select a block action in accordance with the SSP.

Check Contents

If DoD is not at C2C Step 4 or higher, this is not a finding.

Use the Forescout Administrator UI to verify that a policy exists to deny network connections for endpoints that cannot be authenticated using an approved method and that the authentication failure is logged.

1. Log on to Forescout UI.
2. From the Policy tab, select the Authentication and Authorization policy.
3. Find the 802.1x Authorization policy.

If NAC does not have an authorization policy that denies network connection for endpoints that cannot be authenticated using an approved method and log authentication failures, this is a finding.

Vulnerability Number

V-233338

Documentable

False

Rule Version

FORE-NC-000450

Severity Override Guidance

If DoD is not at C2C Step 4 or higher, this is not a finding.

Use the Forescout Administrator UI to verify that a policy exists to deny network connections for endpoints that cannot be authenticated using an approved method and that the authentication failure is logged.

1. Log on to Forescout UI.
2. From the Policy tab, select the Authentication and Authorization policy.
3. Find the 802.1x Authorization policy.

If NAC does not have an authorization policy that denies network connection for endpoints that cannot be authenticated using an approved method and log authentication failures, this is a finding.

Check Content Reference

M

Target Key

5250