Systems are vulnerable due to malicious software like viruses, worms, Trojan horses and spyware that can harm systems. Hackers and computer criminals also exploit software vulnerabilities to carry out illegal activities. Employees within an organization can additionally pose internal threats if they intentionally or accidentally misuse their access or leak sensitive information.

1. System Vulnerability and Abuse
 Why Systems are Vulnerable
 Malicious Software: Viruses, Worms,
Trojan Horses, and Spyware
 Hackers and Computer Crime
 Internal Threats: Employees
 Software Vulnerability
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