In computer security, any weakness or flaw existing in a system, the susceptibility of a system to a specific threat attack or harmful event, or the opportunity available to a threat agent to mount that attack.

• 在计算机安全学中，存在于一个系统内的弱点或缺陷，系统对一个特定的威胁攻击或危险事件的敏感性，或进行攻击的威胁作用的可能性。