What are the security limitations of firewalls ?

The role of a firewall is to let into a network only the types of communications that the organization explicitly authorizes (for example: http and https protocols that allow browsing on the Internet). Unauthorized communications are automatically blocked, limiting the possibility of attack. Back in the early 2000s, firewalls were still an effective means of protection. Today, hackers have adapted. Instead of trying to enter networks via unauthorized protocols, they are moving attacks into the traffic that’s typically authorized to pass through the firewall. For example, hackers inject attack exploits (also called shellcodes) to mine bitcoins via the http protocol. So firewalls let through traffic that looks legitimate, when in reality we are facing an attack.

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