WebRTC Leak: How Your VPN Gets Bypassed

The Browser Feature That Betrays Your VPN

WebRTC (Web Real-Time Communication) is built into every major browser. It powers video calls, voice chat, and peer-to-peer file sharing. It also has a side effect that undermines your VPN: it can reveal your real IP address to any website that asks.

How WebRTC Leaks Work

WebRTC uses STUN servers to discover your network addresses for establishing peer-to-peer connections. This process operates outside the normal HTTP request flow, which means it can bypass your VPN tunnel and proxy settings. A simple JavaScript call can extract your real public and local IP addresses.

What Gets Exposed

A WebRTC leak can reveal your real public IP (the one your VPN is supposed to hide), your local private IP (like 192.168.1.x), and sometimes even your IPv6 address. This is enough to identify you, your network, and your approximate location. Test for WebRTC leaks now.

Which Browsers Are Affected

Chrome, Firefox, Edge, and Opera all have WebRTC enabled by default. Safari has limited WebRTC support with fewer leak vectors. Tor Browser disables WebRTC entirely. Mobile browsers are also affected, particularly Chrome on Android.

How to Prevent WebRTC Leaks

Firefox: Type about:config in the address bar and set media.peerconnection.enabled to false.

Chrome: Install the WebRTC Leak Prevent extension or use a VPN extension that blocks WebRTC.

Edge: Go to edge://flags and disable WebRTC features, or use an extension.

Brave: Go to Settings, then Shields, and set fingerprinting protection to strict mode.

VPN Provider Matters

Good VPN providers include WebRTC leak protection in their browser extensions. Some route STUN requests through the VPN tunnel. Others block WebRTC entirely when connected. If your VPN does not address WebRTC, consider switching providers.

Verify After Every Change

After applying fixes, always verify with our WebRTC Leak Test. Browser updates can reset your settings. New extensions can re-enable WebRTC. Test regularly to maintain your privacy. Complement this with a DNS leak test and a browser fingerprint check for comprehensive protection. Start by confirming your public IP address is hidden.