https://artifacts.trustmarkinitiative.org/lib/tips/nist-sp-800-53-r4-security-control-ac-20_-use-of-external-information-systems/4/NIST SP 800-53 r4 Security Control AC-20: Use of External Information Systems4Profile of requirements corresponding to NIST Special Publication 800-53, r4, Security Control AC-20: Use of External Information Systems. Applicable to LOW impact, MODERATE impact, and HIGH impact systems.2021-04-26T00:00:00.000ZfalseThis document and the information contained herein is provided on an "AS IS" basis, and the Georgia Tech Research Institute disclaims all warranties, express or implied, including but not limited to any warranty that the use of the information herein will not infringe any rights or any implied warranties or merchantability or fitness for a particular purpose. In addition, the Georgia Tech Research Institute disclaims legal liability for any loss incurred as a result of the use or reliance on the document or the information contained herein.https://trustmarkinitiative.org/TMIPRIMARYhelp@trustmarkinitiative.org555-555-5555https://trustmarkinitiative.org/800-53Access ControlExternal Information SystemsHighLowModerateNISTP1SecurityUsehttps://artifacts.trustmarkinitiative.org/lib/tds/use-of-external-information-systems-external-storage-processing-transmission-of-information/1.0/1Use of External Information Systems - External Storage, Processing, Transmission of Information1.0Defines conformance and assessment criteria for compliance with minimum security requirements for use of external information systems - external storage, processing, transmission of information as related to overall access control requirements.https://artifacts.trustmarkinitiative.org/lib/tds/use-of-external-information-systems-access-from-external-systems/1.0/2Use of External Information Systems - Access From External Systems1.0Defines conformance and assessment criteria for compliance with minimum security requirements for use of external information systems - access from external systems as related to overall access control requirements.SP800-53R4NIST Special Publication 800-53 Revision 4, Security and Privacy Controls for Federal Information Systems and Organizations, National Institute of Standards and Technology, April 2013 (Includes updates as of 01-15-2014). Available at <a href="http://dx.doi.org/10.6028/NIST.SP.800-53r4">http://dx.doi.org/10.6028/NIST.SP.800-53r4</a>.