None

  A safeguard or countermeasure prescribed for an information system or an organization designed to protect the confidentiality, integrity, and availability of its information and to meet a set of defined security requirements.
Source(s):
NIST SP 800-161 under Security Control FIPS 199 - Adapted
NIST SP 800-53 Rev. 4 under Security Control FIPS 199 - Adapted

  The safeguards or countermeasures prescribed for an information system or an organization to protect the confidentiality, integrity, and availability of the system and its information.
Source(s):
NIST SP 800-128 OMB Circular A-130
NIST SP 800-171 Rev. 2 OMB Circular A-130
NIST SP 800-37 Rev. 2

  A protective measure against threats.
Source(s):
NIST SP 800-69 under Security Control [Withdrawn]

  The management, operational, and technical controls (i.e., safeguards or countermeasures) prescribed for a system to protect the confidentiality, integrity, and availability of the system, its components, processes, and data.
Source(s):
NISTIR 8183 under Security Control NIST SP 800-82 Rev. 2
NISTIR 8183A Vol. 1 under Security Control NIST SP 800-82
NISTIR 8183A Vol. 2 under Security Control NIST SP 800-82
NISTIR 8183A Vol. 3 under Security Control NIST SP 800-82

  A safeguard or countermeasure prescribed for a system or an organization designed to protect the confidentiality, integrity, and availability of its information and to meet a set of defined security requirements.
Source(s):
NIST SP 800-171 Rev. 1 [Superseded] FIPS 199 - Adapted

  A mechanism designed to address needs as specified by a set of security requirements.
Source(s):
NIST SP 800-160 Vol.2
NIST SP 800-160 [Superseded]