When intruders want to break into an establishment, they look for an opening. An open port is one of the openings that a hacker or threat actor looks for to access a digital network. That open port may be on a firewall, a server, or any network-connected computing device. Just as a single unlocked door can jeopardize your privacy and grant access to a physical building, a single open port can provide a point for hackers to breach your systems, exposing you to their malicious intents.