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AC.L1-3.1.22Control Public Information

Level 1
FAR 52.204-21 b.
800-171: 3.1.22

>Control Description

Control information posted or processed on publicly accessible information systems.

>Cross-Framework Mappings

NIST SP 800-171

>Assessment Interview Topics

Questions assessors commonly ask

Process & Governance:

  • What policies govern what information can be posted on publicly accessible systems?
  • How do you review and approve content before it is published publicly?
  • Who is responsible for monitoring and controlling publicly accessible information?
  • What is your incident response process if CUI is inadvertently posted publicly?

Technical Implementation:

  • What technical controls prevent CUI from being posted to public systems?
  • How do you technically separate public-facing and internal content?
  • What DLP or content filtering tools monitor publicly posted information?
  • What technical approval workflows govern content publication?
  • What scanning or monitoring detects CUI on public systems?

Evidence & Documentation:

  • What documentation demonstrates your access control policies and procedures?
  • What access control matrices or permissions documentation can you provide?
  • What access request and approval records can you show?
  • What access review documentation demonstrates periodic reviews?
  • What audit logs demonstrate access control enforcement?
  • What screenshots or configuration exports show access control settings?

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