Why Open Wi-Fi Is Risky

An open Wi-Fi network has no password and no encryption, anyone in range can join and, worse, can see traffic flying through the air. Because Wi-Fi is broadcast over radio, open networks expose users to serious risks. This lesson explains exactly what attackers can do on an unprotected wireless network and why open Wi-Fi should be treated with great caution.

The core problem is that wireless signals travel through the air in all directions. On a wired network, an attacker must physically tap a cable. On Wi-Fi, anyone within radio range can listen, no physical access required. If the network is open and unencrypted, that listening reveals the actual contents of traffic, not just its presence. This is what makes open Wi-Fi inherently dangerous.