A form of controlled interface that provides the ability to manually and/or automatically access and/or transfer information between different security domains.
Source(s):
CNSSI 4009-2015
from
NIST SP 800-37 Rev. 1, NIST SP 800-53 Rev. 4, CNSSI 1253F Attachment 3
NIST SP 800-53 Rev. 5
under cross domain solution
from
CNSSI 1253
NIST SP 800-37 Rev. 1
[Superseded]
under Cross Domain Solution
NIST SP 800-53 Rev. 4
[Superseded]
under Cross Domain Solution
from
CNSSI 4009