NIST SP 800-171 Control 3.10.3: Visitor Access Control
Visitor access control is a critical physical security requirement that ensures only authorized individuals can enter your facilities and access sensitive CUI. This control requires you to escort visitors and actively monitor their activity to prevent unauthorized access or data exposure. Without proper visitor management procedures, your organization risks insider threats and physical security breaches.
What this means
Control 3.10.3 requires organizations to establish and enforce procedures for escorting visitors throughout facilities and monitoring their activities. This means you must assign personnel to accompany visitors in areas where controlled unclassified information (CUI) is processed, stored, or transmitted. Visitor activity monitoring includes tracking who enters, where they go, how long they stay, and what they access. The control assumes visitors are not pre-cleared security personnel and therefore require active supervision to prevent unauthorized access to sensitive systems and data.
How to comply
- 1.Develop a visitor access policy that defines which areas require escort and which visitors need supervision
- 2.Establish a visitor sign-in/sign-out process that captures arrival time, purpose, and assigned escort
- 3.Designate trained personnel as visitor escorts who understand CUI handling and physical security requirements
- 4.Conduct visitor briefings on security requirements, restricted areas, and acceptable use policies before facility entry
- 5.Monitor and log visitor activity in restricted areas, including duration of stay and areas visited
- 6.Implement badging or credential systems that visually identify visitors and distinguish them from employees
- 7.Review visitor logs and access records regularly to identify anomalies or unauthorized activity
- 8.Terminate visitor access immediately upon departure and collect all visitor credentials and badges
Evidence auditors look for
- Visitor access control policy documentation
- Visitor sign-in/sign-out logs with timestamps, purposes, and assigned escorts
- Visitor badges or temporary credentials issued and collected
- Security briefing materials provided to visitors
- Escort assignment records and training documentation
- Visitor access review reports and audit logs
- Facility maps showing areas requiring visitor escort supervision
- Incident reports documenting visitor-related security events
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
GRCWatch streamlines visitor access logging and tracking by automating sign-in workflows, generating escort assignments, and maintaining audit-ready visitor activity records—eliminating manual spreadsheets and compliance gaps.
See how GRCWatch handles this control automatically
Start free trial