WebRTC Leak
When your real IP address is exposed through the browser's built-in real-time communication feature, even when using a VPN or proxy.
Full Definition
WebRTC (Web Real-Time Communication) is a browser API that enables peer-to-peer communication — video calls, voice chat, file sharing — without plugins. To establish direct connections, WebRTC uses ICE (Interactive Connectivity Establishment) to discover the client's local and public IP addresses, often bypassing the VPN tunnel and exposing the real IP to any website running a WebRTC session discovery script. This vulnerability affects most browsers when using a VPN or HTTP proxy that only routes web traffic. Mitigations include disabling WebRTC in browser settings, using browser extensions that block WebRTC, or using a VPN that routes WebRTC traffic through the tunnel.
