NIST SP 800-53 Rev 5
AC - Access Control

NIST SP 800-53 Rev 5 NIST800-AC-20(1): AC-20(1) Use of External Systems | Limits on Authorized Use

Permit authorized individuals to use an external system to access the system or to process, store, or transmit organization-controlled information only after: (a) Verification of the implementation of controls on the external system as specified in the organization’s security and privacy policies and security and privacy plans; or (b) Retention of approved system connection or processing agreements with the organizational entity hosting the external system.

Maintained by Gerard BlokdykVerified against the published standard Control text last updated

What else in your programme already covers this

This control maps to 2 controls across 2 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 SP 800-53 Rev 5 HIGH · 1 control

  • AC-20(1) AC-20(1) Use of External Systems | Limits on Authorized Use

NIST SP 800-53 Rev 5 MODERATE · 1 control

  • AC-20(1) AC-20(1) Use of External Systems | Limits on Authorized Use

Every mapping shown was judged rather than inferred from wording similarity, and the ones that failed review are published too. See the coverage reports and what was rejected.

Other controls in AC - Access Control

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-20(1) 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.

If you hold ISO 27001:202216.1% covered · 851 gapsIf you hold ISO 27002:202210.8% covered · 904 gapsIf you hold Cloud Security Alliance Cloud Controls Matrix (CCM) v4.0.110.2% covered · 911 gapsIf you hold CIS Controls v810.1% covered · 912 gapsIf you hold NIST SP 800-171 Rev 310.1% covered · 912 gapsIf you hold C5 (Germany)9.6% covered · 917 gaps

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.

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Query this from an agent

The graph holds this control, the 2 it maps to, and the evidence behind each claim, over MCP and REST.

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