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backdoor

Definitions:

  An undocumented way of gaining access to computer system. A backdoor is a potential security risk.
Sources:
CNSSI 4009-2015
NIST SP 800-12 Rev. 1 under Back door from NIST SP 800-82r3

  An undocumented way of gaining access to a computer system. A backdoor is a potential security risk.
Sources:
NIST SP 1800-25B under Backdoor from NIST SP 800-82r3
NIST SP 1800-26B under Backdoor from NIST SP 800-82r3
NIST SP 800-82r3 under Backdoor

  A malicious program that listens for commands on a certain Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) port.
Sources:
NIST SP 800-83 Rev. 1 under Backdoor