1. First and foremost, there is the economic loss and loss of business. Hacker's attack can lead to interruption of the victim's business, data leakage; in serious cases, it can make a company's annual profit into a void.
2. Second, personal safety. In the cloud era, and even the future IOT era, security will affect everyone's life. For example, hackers use loopholes to view patient information and invade medical equipment. Driverless cars and airport route monitoring systems. Every extremely dangerous threat that slips through the cracks has the potential to impact personal safety and social security in the future.
3. Finally, there is the damage to the entire Internet environment. When a hacker attacks a server, it is likely to turn the server into a "puppet machine" to help it attack other hosts. If there is important user data on the server, such as banking, credit cards, personal privacy, medical information, etc., it will flow into the blackmail trade chain - these are just a few snapshots of the harm caused by network attacks, if the defenders do not take action, the attackers will be repeated, in the long run, the network security environment will become worse and worse.