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.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Firefox | Mozilla | 4.0-beta1 (including) | 4.0-beta1 (including) |
| Firefox | Mozilla | 4.0-beta2 (including) | 4.0-beta2 (including) |
| Firefox | Mozilla | 4.0-beta3 (including) | 4.0-beta3 (including) |
| Firefox | Mozilla | 4.0-beta4 (including) | 4.0-beta4 (including) |
| Firefox | Mozilla | 4.0-beta5 (including) | 4.0-beta5 (including) |
| Firefox | Mozilla | 4.0-beta6 (including) | 4.0-beta6 (including) |
| Firefox | Ubuntu | dapper | * |
| Firefox | Ubuntu | devel | * |
| Firefox | Ubuntu | hardy | * |
| Firefox | Ubuntu | upstream | * |