Vulnerability

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Definition #1

A Vulnerability is a Cybersecurity term that refers to a flaw in a system that can leave it open to attack. A vulnerability may also refer to any type of Weakness in a computer system itself, in a set of Business Processes, or in anything that leaves information security exposed to a cyberthreat.

Source: https://www.techopedia.com/definition/13484/vulnerability

Definition #2

A Weakness or flaw in the functional behavior of a vulnerable computational Component (Software (SW) or Hardware (H/W)) that can be exploited, resulting in a negative impact to the Confidentiality, Integrity, and/or Availability of an impacted Component.

Source: https://www.first.org/cvss/user-guide#Glossary-of-Terms