Security
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A vulnerability is a weakness in a system that might allow a threat to become realized. For example, if a secure server is left unlocked, it might be possible for a malicious user to physically access the computer and copy files to a floppy disk.
Vulnerabilities in computer systems could be bugs in the software or hardware, or they could be the result of administrative error. Examples of administrative errors include choosing a weak password (one that someone can easily guess) for the Administrator account, or accidentally setting an insecure discretionary access control list (DACL) on a confidential file.