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03.13.06 Network Communications – Deny by Default – Allow by Exception

NIST SP 800-171 Rev 3 (CUI; CMMC Level 2) OSCAL 1.1.0
All changes in this version
first version loaded 03.13 System and Communications Protection

Title

Network Communications – Deny by Default – Allow by Exception

Control

Deny network communications traffic by default, and allow network communications traffic by exception.

Discussion

This requirement applies to inbound and outbound network communications traffic at the system boundary and at identified points within the system. A deny-all, allow-by-exception network communications traffic policy ensures that only essential and approved connections are allowed.

Assessment objective

network communications traffic is denied by default.