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

Forescout must place client machines on a blacklist or terminate network communications on devices when critical security issues are found that put the network at risk. This is required for compliance with C2C Step 4.

DISA Rule

SV-233318r1146396_rule

Vulnerability Number

V-233318

Group Title

SRG-NET-000015-NAC-000120

Rule Version

FORE-NC-000100

Severity

CAT I

CCI(s)

• CCI-000213 - Enforce approved authorizations for logical access to information and system resources in accordance with applicable access control policies.

Weight

10

Fix Recommendation

Use the Forescout Administrator UI to configure compliance policies to ensure any device with critical security issues is added to a blacklist, had its network communication blocked, or isolated from trusted network traffic for remediation.

1. From the Policy tab, identify a Compliance policy.
2. Within the Compliance policy, under Sub-Rule for a device with critical security issues, ensure that an action that Adds Device to Blacklist and/or Disables Device is enabled.

If Forescout does not place client machines on a blacklist or terminate network communications on devices when critical security issues are found that put the network at risk, this is a finding.

Check Contents

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

Check Forescout policy to ensure that any device with a critical security issue is checked through a security policy and an action is taken to either blacklist it or terminate communication with other network devices.

If the NAC does not immediately place the device on the blacklist and terminate the connection when critical security issues are found that put the network at immediate risk, this a finding.

Vulnerability Number

V-233318

Documentable

False

Rule Version

FORE-NC-000100

Severity Override Guidance

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

Check Forescout policy to ensure that any device with a critical security issue is checked through a security policy and an action is taken to either blacklist it or terminate communication with other network devices.

If the NAC does not immediately place the device on the blacklist and terminate the connection when critical security issues are found that put the network at immediate risk, this a finding.

Check Content Reference

M

Target Key

5250