Mapped to NIST 800-171 Requirement: 3.13.14
CMMC Assessment Objective: SC.L2-3.13.14[b]
What This Control Means
After identifying your transfer control mechanisms (SC.L2-3.13.14[a]), this control ensures you record them properly in your compliance documentation, typically including:
• System Security Plan (SSP)
• Network security architecture diagrams
• Firewall, DLP, or email gateway configuration records
• Secure communication and data handling policies
Your documentation must explain where, how, and with what tools CUI movement is restricted, monitored, or controlled.
Why It Matters
Without documented control methods:
• Internal teams may miss critical protection points
• Auditors cannot verify how you control CUI movements
• CUI could be transferred insecurely or without authorization
• Risk management and incident response efforts are weakened
Documentation ensures proactive control over CUI boundary flows and supports audit readiness.
How to Implement It
1. Update Your SSP and Policies Clearly describe:
• What systems and boundary points are protected
• How outbound and inbound CUI transfers are managed
• What inspection, monitoring, and blocking mechanisms are used
• What encryption standards are applied for CUI in transit
2. Use Diagrams and Lists
• Highlight:
◦ Data flow restrictions
◦ Approved communication channels
◦ Tools used to detect or prevent unauthorized CUI transfer
3. Link Controls to Compliance Standards
• Reference NIST 800-171, DFARS 7012, or CMMC security objectives as applicable
4. Assign Ownership
• Document who is responsible for maintaining these boundary protections and monitoring transfer activities
Evidence the Assessor Will Look For
• SSP entries describing system boundary protections and CUI transfer controls
• Network diagrams showing control points (e.g., firewalls, DLP, CASB)
• Configuration settings from DLP, email gateways, or proxy servers
• Policies mandating encryption, data classification, and secure transfer procedures
• Records of boundary security reviews and updates
Common Gaps
• Boundary controls exist but aren’t documented
• Documentation lists tools (e.g., firewalls) but not specific CUI protections
• No tracking of cloud or external system boundaries handling CUI
• No connection between boundary protections and CUI data flow restrictions
How Cuick Trac Helps
Cuick Trac supports this requirement by:
• Documenting system boundary control and CUI transfer mechanisms
• Mapping data flows and protection points into SSPs and network diagrams
• Linking monitoring tools and outbound/inbound restrictions to your risk register
• Storing audit-ready records showing where CUI is controlled at system edges
• Supporting ongoing reviews and change management of CUI flow protections
With Cuick Trac, your CUI boundary protections are fully mapped, monitored, and documented.
Final CTA
You can’t prove you’re protecting CUI until you document how you do it.
Schedule a Cuick Trac demo to document your boundary protections and CUI transfer controls with confidence.