| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | = 31.0= 31.1.0= 31.1.1= 31.3.0= 31.5.1= 31.5.2= 31.5.3= 38.0≤ 38.1.0 | |
| firefox esr | = 31.1= 31.2= 31.3= 31.4= 31.5= 31.6.0= 31.7.0 |
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.
Running one of these products? Scan your site to see whether it exposes a vulnerable version.
Scan my site free