The WebSockets implementation in Mozilla Firefox 4 through 4.0 Beta 7 does not properly perform proxy upgrade negotiation, which has unspecified impact and remote attack vectors, related to an "inherent problem" with the WebSocket specification.
| Software | From | Fixed in |
|---|---|---|
| mozilla / firefox | 4.0-beta6 | 4.0-beta6.x |
| mozilla / firefox | 4.0-beta1 | 4.0-beta1.x |
| mozilla / firefox | 4.0-beta5 | 4.0-beta5.x |
| mozilla / firefox | 4.0-beta3 | 4.0-beta3.x |
| mozilla / firefox | 4.0-beta2 | 4.0-beta2.x |
| mozilla / firefox | 4.0-beta4 | 4.0-beta4.x |