June 2, 2025
What is NIST 800-171 Control 3.8.7?
NIST 800-171 Control 3.8.7 focuses on reducing the risk of data loss by requiring organizations to control and monitor the use of removable media that may store or transmit Controlled Unclassified Information (CUI).
Because removable media can easily be lost, stolen, or misused, this control ensures that its use is restricted, tracked, and aligned with organizational security policies.
What Counts as Removable Media?
Removable media includes any portable device capable of storing or transferring data, such as:
- USB flash drives
- External hard drives and SSDs
- CDs, DVDs, and other optical media
- Memory cards and similar portable storage devices
Why This Control Matters
Removable media is a common source of data exposure incidents. Without proper controls, organizations risk:
- Unauthorized disclosure of CUI
- Loss or theft of sensitive data
- Malware introduction into secure environments
- Audit findings related to weak media controls
Control 3.8.7 helps ensure that data protection extends beyond traditional network boundaries.
How to Implement Control 3.8.7
An effective removable media control program should include both policy and technical safeguards.
- Define and document acceptable use of removable media in security policies.
- Restrict removable media usage to approved devices and authorized users.
- Monitor and log media use, including connection and data transfer events.
- Encrypt removable media when storing or transporting CUI.
- Scan media for malware before use within protected systems.
- Train users on proper handling and security expectations.
Common Mistakes to Avoid
- Allowing unrestricted USB or removable media access
- Failing to track who uses removable media and when
- Relying on informal practices instead of documented policies
How Cuick Trac Helps
Cuick Trac helps organizations document and manage compliance with removable media controls by supporting:
- Policy and control documentation aligned to NIST 800-171
- Tracking of control implementation and effectiveness
- Evidence organization for audits and assessments
- Visibility into compliance posture across security domains
Next Step
Removable media doesn’t have to be a blind spot. With clear controls and monitoring, you can reduce risk and protect CUI wherever it travels.
Frequently Asked Questions
What is NIST 800-171 Control 3.8.7?
Control 3.8.7 requires organizations to control the use of removable media and monitor its movement to protect the confidentiality of Controlled Unclassified Information (CUI).
What types of media are covered under Control 3.8.7?
This control applies to removable media such as USB drives, external hard drives, CDs/DVDs, and other portable storage devices capable of storing or transferring CUI.
Why is monitoring removable media important for protecting CUI?
Uncontrolled removable media can lead to data loss, theft, or unauthorized disclosure of CUI, making monitoring and usage restrictions critical for compliance and risk reduction.