Mozilla Firefox before 39.0, Firefox ESR 38.x before 38.1, and Thunderbird before 38.1 do not enforce key pinning upon encountering an X.509 certificate problem that generates a user dialog, which allows user-assisted man-in-the-middle attackers to bypass intended access restrictions by triggering a (1) expired certificate or (2) mismatched hostname for a domain with pinning enabled.
| Software | From | Fixed in |
|---|---|---|
| mozilla / firefox | - | 38.1.0.x |
| oracle / solaris | 11.3 | 11.3.x |
| mozilla / firefox_esr | 31.1 | 31.1.x |
| mozilla / firefox_esr | 31.7.0 | 31.7.0.x |
| mozilla / firefox_esr | 31.5 | 31.5.x |
| mozilla / firefox_esr | 31.6.0 | 31.6.0.x |
| mozilla / firefox_esr | 31.3 | 31.3.x |
| mozilla / firefox_esr | 31.2 | 31.2.x |
| mozilla / firefox_esr | 31.4 | 31.4.x |
| mozilla / firefox | 31.0 | 31.0.x |
| mozilla / firefox | 31.1.0 | 31.1.0.x |
| mozilla / firefox | 31.1.1 | 31.1.1.x |
| mozilla / firefox | 31.3.0 | 31.3.0.x |
| mozilla / firefox | 31.5.1 | 31.5.1.x |
| mozilla / firefox | 31.5.2 | 31.5.2.x |
| mozilla / firefox | 31.5.3 | 31.5.3.x |
| mozilla / firefox | 38.0 | 38.0.x |