The level of system and network configuration required for Controlled Unclassified Information (CUI) is generally considered moderate. This means organizations must implement robust but balanced security measures to protect CUI without excessive complexity.

Key Requirements for CUI System and Network Configuration

• Moderate Confidentiality Impact : CUI is classified as having a moderate confidentiality impact, requiring protections that prevent unauthorized access or disclosure but not as stringent as classified information

• Compliance with NIST SP 800-171 : Organizations handling CUI must comply with the National Institute of Standards and Technology (NIST) Special Publication 800-171. This includes 110 security requirements across 14 families such as access control, audit and accountability, configuration management, incident response, and system communications protection

• Access Controls : Implementation of strict access controls to ensure only authorized personnel can access CUI, often using role-based access control (RBAC) and multi-factor authentication (MFA)

• Encryption : Data must be encrypted both at rest and in transit to safeguard against interception or unauthorized access

• Network Segmentation and Firewalls : Networks should be segmented to limit the spread of breaches, and firewalls configured to block unauthorized access attempts

• System Security Plans (SSPs) : Organizations must develop and maintain SSPs that document how security controls are implemented and maintained

• Regular Monitoring and Audits : Continuous monitoring, security assessments, and audits are required to identify vulnerabilities and ensure ongoing compliance

• Incident Response Planning : Establishing and maintaining an incident response plan specifically addressing CUI-related security incidents is essential

• Certification Requirements : Defense Industrial Base (DIB) contractors handling CUI must achieve at least CMMC Level 3 certification, demonstrating adherence to required security practices

Summary

Aspect| Requirement
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Confidentiality Level| Moderate
Framework| NIST SP 800-171 (110 requirements)
Access Control| Role-based access control, multi-factor authentication
Encryption| Required for data at rest and in transit
Network Security| Firewalls, network segmentation
Documentation| System Security Plans (SSPs)
Monitoring and Auditing| Continuous monitoring, regular security assessments
Incident Response| Formal incident response plan for CUI
Certification| CMMC Level 3 for contractors handling CUI

This moderate level of system and network configuration balances security and usability, ensuring CUI is protected in compliance with DoD instructions (DoDI 5200.48, 8500.01, 8510.01) and federal standards without imposing overly burdensome controls