For years, it's been an inconvenient truth within the cybersecurity industry that the network security devices sold to protect customers from spies and cybercriminals are, themselves, often the machines those intruders hack to gain access to their targets. Again and again, vulnerabilities in “perimeter” devices like firewalls and VPN appliances have become footholds for sophisticated hackers trying to break into the very systems those appliances were designed to safeguard.Now one cybersecurity v...