The Public Key Pinning (PKP) implementation in Mozilla Firefox before 33.0 does not properly consider the connection-coalescing behavior of SPDY and HTTP/2 in the case of a shared IP address, which allows man-in-the-middle attackers to bypass an intended pinning configuration and spoof a web site by providing a valid certificate from an arbitrary recognized Certification Authority.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Firefox | Mozilla | * | 32.0 (including) |
| Firefox | Mozilla | 30.0 (including) | 30.0 (including) |
| Firefox | Mozilla | 31.0 (including) | 31.0 (including) |
| Firefox | Mozilla | 31.1.0 (including) | 31.1.0 (including) |