### Comment:
How can an attacker gain unauthorized access to a computer system?

### REPLY:
Attackers can gain unauthorized access to a computer system through various methods such as exploiting vulnerabilities in software or operating systems, using brute force attacks to guess weak passwords, conducting phishing attacks to trick users into revealing their login credentials, or using keyloggers to capture sensitive information. It is important to note that engaging in such activities is illegal and punishable by law.