Key Pinning Bypass Vulnerability in Mozilla Firefox and Thunderbird

CVE-2015-2741 · MEDIUM Severity

AV:N/AC:M/AU:N/C:N/I:P/A:N

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.

Learn more about our User Device Pen Test.