What is a Vulnerability A software vulnerability  is a flaw or weakness in a system that attackers can use to break in, steal data, or disrupt services. Think of a vulnerability like an unlocked door  in your house. You didn’t mean to leave it open—but if someone with bad intentions notices it, they can get inside. Key Characteristics of Vulnerabilities Weakness:  A bug, misconfiguration, or design flaw Exploitable:  Can be used by attackers Impactful:  Can steal, corrupt, or