This is a potential security issue, you are being redirected to https://csrc.nist.gov.
A security event, or a combination of multiple security events, that constitutes a security incident in which an intruder gains, or attempts to gain, access to a system or system resource without having authorization to do so.
CNSSI 4009-2015 from IETF RFC 4949 Ver 2
CNSSI 4009-2015 under penetration
any set of actions that attempts to compromise the integrity, confidentiality, or availability of a resource
NIST SP 800-35 under Intrusion