NIST SP 800-53 Rev 5 NIST800-AC-21: AC-21 Information Sharing
a. Enable authorized users to determine whether access authorizations assigned to a sharing partner match the information’s access and use restrictions for [Assignment: organization-defined information sharing circumstances where user discretion is required]; and b. Employ [Assignment: organization-defined automated mechanisms or manual processes] to assist users in making information sharing and collaboration decisions.
Maintained by Gerard Blokdyk·Verified against the published standard ·Control text last updated
What else in your programme already covers this
This control maps to 38 controls across 19 other frameworks. If you already hold one of them, the evidence you collected for it is the starting point here rather than new work.
NIST-CSF-ID.AM-07 Inventories of data and corresponding metadata for designated data types are maintained
NIST-CSF-PR.AA-05 Access permissions, entitlements, and authorizations are defined in a policy, managed, enforced, and reviewed, and incorporate the principles of least privilege and separation of duties
NIST-CSF-PR.DS-01 The confidentiality, integrity, and availability of data-at-rest are protected
NIST-CSF-RS.CO-03 Information is shared with designated internal and external stakeholders
You are reading one control. How much of NIST SP 800-53 Rev 5 have you already done?
NIST SP 800-53 Rev 5 NIST800-AC-21 is one control. If you already hold one of the frameworks below, a reviewed crosswalk already says how much of NIST SP 800-53 Rev 5 your existing evidence covers. Hold ISO 27001:2022 and 163 of 1014 NIST SP 800-53 Rev 5 controls already carry evidence.
Each report names every control your existing framework evidences, every one it does not, the reasoning behind each claim, and the claims that were argued against and rejected. 342 were rejected on the ISO 27001:2022 pair alone.