Because the computer update is to update the system, so nothing is checked.

There is no perfect system in the world, and any system has some loopholes. System vulnerabilities are specifically manifested as:

1. Invades the user's operating system, implants a Trojan horse, and illegally obtains information. Take Trojan Horse as an example, it can be hidden behind normal software. In the process of performing the scheduled task, the Trojan will also perform illegal tasks in the background without the user's knowledge.

2. Malicious destruction of the user's operating system, hindering the normal operation of the system. The virus is a very typical example. As a malicious program, it can infect the whole system by copying itself or regenerating it, destroy system data or occupy system resources, and finally paralyze the system.

3. A typical example is the logic bomb, which hinders the execution of the scheduled task of the system.

4. Hacking can be considered as modifying or even destroying the function of the system, making it unable to work normally or even paralyzed.