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weakness

Definitions:

  Defect or characteristic that may lead to undesirable behavior.
Sources:
NIST SP 800-160v1r1 from ISO/SAE 21434:2021

  (As used in this volume) Poor coding practices, as exemplified by CWEs
Sources:
NISTIR 8011 Vol. 4

  A condition in a software, firmware, hardware, or service component that, under certain circumstances, could contribute to the introduction of vulnerabilities.
Sources:
NIST IR 8517 from MITRE CWE

  A bug or fault type that can be exploited through an operation that results in a security-relevant error.
Sources:
NIST IR 8517 from Bellay21