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external information system (or component)

Definitions:

  An information system or component of an information system that is outside of the authorization boundary established by the organization and for which the organization typically has no direct control over the application of required security controls or the assessment of security control effectiveness.
Sources:
CNSSI 4009-2015

  A system or component of a system that is outside of the authorization boundary established by the organization and for which the organization typically has no direct control over the application of required security controls or the assessment of security control effectiveness.
Sources:
NIST SP 800-172 under external system (or component)
NIST SP 800-171 Rev. 2 under external system (or component)

  A system or system element that is outside of the authorization boundary established by the organization and for which the organization typically has no direct control over the application of required controls or the assessment of control effectiveness.
Sources:
NIST SP 800-37 Rev. 2 under external system (or component)

  A system or component of a system that is used by but is not a part of an organizational system and for which the organization has no direct control over the implementation of required security and privacy controls or the assessment of control effectiveness.
Sources:
NIST SP 800-53 Rev. 5 under external system (or component)