Insider Threats and CMMC: Protecting CUI at Arizona Defense Companies

Insider threats aren’t just espionage

When Arizona defense contractors hear “insider threat,” they picture a spy stealing classified documents. The reality is far more mundane and far more common: an employee emails CUI to their personal account to work from home. A departing employee downloads client files to a USB drive. A contractor with excessive access permissions browses directories they shouldn’t be in.

These aren’t malicious acts. They’re careless ones. But under NIST SP 800-171 and CMMC Level 2, your organization must have controls to detect, prevent, and respond to all of them.

What CMMC requires for insider threat

Several NIST 800-171 control families address insider threat directly:

  • Access Control (3.1): Limit access to CUI based on job function. No employee should have access to more CUI than their role requires.
  • Audit and Accountability (3.3): Log all access to CUI systems. Review logs regularly for anomalies.
  • Personnel Security (3.9): Screen employees before granting CUI access. Revoke access immediately upon termination or role change.
  • Awareness and Training (3.2): Train all CUI users to recognize and report insider threat indicators.

Practical insider threat program for small contractors

You don’t need a dedicated security team. Arizona defense subcontractors with 25-200 employees can implement a practical insider threat program with:

  • Role-based access controls enforced through Active Directory or cloud identity
  • DLP (Data Loss Prevention) rules that flag CUI being emailed externally or copied to USB
  • Automated alerts for after-hours access to CUI repositories
  • Quarterly access reviews to remove excessive permissions
  • Documented termination procedures that revoke access within 24 hours
  • Annual insider threat awareness training for all CUI users

Building your program

Asteroid IT helps Arizona defense contractors build CMMC-compliant insider threat programs that satisfy NIST 800-171 requirements without enterprise-level budgets. We serve contractors across Chandler, Mesa, and Tucson.

Call us at 480-937-7021 or schedule a conversation.

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