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SP 800-171 Rev. 2

Protecting Controlled Unclassified Information in Nonfederal Systems and Organizations

Date Published: February 2020 (includes updates as of January 28, 2021)

Supersedes: SP 800-171 Rev. 2 (02/21/2020)

Planning Note (3/9/2021):

NIST SP 800-171, Revision 2 issued on 1/28/2021 is an errata update. It is consistent with NIST procedures and criteria for errata updates, whereby a new copy of a final publication is issued to include corrections that do not alter existing or introduce new technical information or requirements. Such corrections are intended to remove ambiguity and improve interpretation of the work, and may also be used to improve readability or presentation (e.g., formatting, grammar, spelling). 

Specifically in SP 800-171, Revision 2, an existing paragraph was moved to an earlier section to emphasize existing relevant supplemental guidance about the applicability of the security requirements. The changes in the applicability paragraph are editorial in nature and do not impact the publication's scope or implementation, nor introduce new technical information.

Documentation > Supplemental Material > CUI SSP template:

** There is no prescribed format or specified level of detail for system security plans. However, organizations ensure that the required information in [SP 800-171 Requirement] 3.12.4 is conveyed in those plans.


Ron Ross (NIST), Victoria Pillitteri (NIST), Kelley Dempsey (NIST), Mark Riddle (NARA), Gary Guissanie (IDA)



basic security requirement; contractor systems; Controlled Unclassified Information; CUI Registry; derived security requirement; Executive Order 13556; FIPS Publication 199; FIPS Publication 200; FISMA; NIST Special Publication 800-53; nonfederal systems; security assessment; security control; security requirement; nonfederal organizations
Control Families

Access Control; Audit and Accountability; Awareness and Training; Configuration Management; Identification and Authentication; Maintenance; Media Protection; Personnel Security; Physical and Environmental Protection; System and Communications Protection; System and Information Integrity