STIGQter: STIG Summary: Layer 2 Switch Security Requirements Guide Version: 3 Release: 4 Benchmark Date: 01 Apr 2026:

The layer 2 switch must have Unknown Unicast Flood Blocking (UUFB) enabled.

DISA Rule

SV-206657r856587_rule

Vulnerability Number

V-206657

Group Title

SRG-NET-000362

Rule Version

SRG-NET-000362-L2S-000024

Severity

CAT II

CCI(s)

CCI-002385 - Protect against or limit the effects of organization-defined types of denial of service events.

Weight

Fix Recommendation

Configure the switch to have Unknown Unicast Flood Blocking (UUFB) enabled.

Check Contents

Review the switch configuration to verify that UUFB is enabled on all access switch ports.

If any access switch ports do not have UUFB enabled, this is a finding.

Vulnerability Number

V-206657

Documentable

False

Rule Version

SRG-NET-000362-L2S-000024

Severity Override Guidance

Review the switch configuration to verify that UUFB is enabled on all access switch ports.

If any access switch ports do not have UUFB enabled, this is a finding.

Check Content Reference

Target Key

2913