- Allow port forwarding
- Have no protection against this specific attack
“The crucial issue here is that a VPN user connecting to his own VPN server will use his default route with his real IP address, as this is required for the VPN connection to work,” Perfect Privacy wrote in a blog post on Thursday.
How Does ‘Port Fail’ Work?
Also Read: Hackers Backdooring Cisco WebVPN To Steal Customers’ Passwords