NIST SP 800-171 Rev 2 · 3.1 Access Control
3.1.3 Control CUI flow
Control the flow of CUI in accordance with approved authorizations.
- SPRS weight
- 1
- 1 point deducted from 110 when not implemented.
- CMMC level
- L2
- Level 2 only; not among the 17 Level 1 practices.
- Assessment objectives
- 5
- From NIST SP 800-171A, each one a “determine if” an assessor answers.
What an assessor checks
NIST SP 800-171A breaks 3.1.3 into 5 objectives. Every one has to be met for the requirement to be met; a partial answer scores as not implemented.
- [a]Determine if information flow control policies are defined.
- [b]Determine if methods and enforcement mechanisms for controlling the flow of CUI are defined.
- [c]Determine if designated sources and destinations (e.g., networks, individuals, and devices) for CUI within systems and between interconnected systems are identified.
- [d]Determine if authorizations for controlling the flow of CUI are defined.
- [e]Determine if approved authorizations for controlling the flow of CUI are enforced.
- Examine
- [SELECT FROM: Access control policy; information flow control policies; procedures addressing information flow enforcement; security plan; system design documentation; system configuration settings and associated documentation; list of information flow authorizations; system baseline configuration; system audit logs and records; other relevant documents or records].
- Interview
- [SELECT FROM: System or network administrators; personnel with information security responsibilities; system developers].
- Test
- [SELECT FROM: Mechanisms implementing information flow enforcement policy].
If it is open: POA&M eligibility
May be carried on a Level 2 POA&M · 1 point deducted
A 1-point requirement outside the six named exclusions - eligible to carry, and NOT MET until a closeout assessment confirms it.
A POA&M is only permitted at a score of 88 or above, and closes in one 180-day window. Check a full gap list or compute your score.
Where 3.1.3 maps
NIST SP 800-53 Rev 5
- AC-4 Information Flow Enforcement
NIST CSF 2.0
- Access is managed
- Data-in-use is protected
SOC 2
No direct mapping.
Query it from your own tools
This page and the MacTech CMMC MCP server render the same dataset. Ask your assistant and it will answer from the methodology, not from memory.
lookup_control 3.1.3 get_assessment_objectives 3.1.3 generate_poam_entries ["3.1.3"]
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