CVE-2015-0832: Canonical Ubuntu Linux

Medium severity, CVSS 5.0. EPSS: 1% chance of exploitation in the next 30 days.

Mozilla Firefox before 36.0 does not properly recognize the equivalence of domain names with and without a trailing . (dot) character, which allows man-in-the-middle attackers to bypass the HPKP and HSTS protection mechanisms by constructing a URL with this character and leveraging access to an X.509 certificate for a domain with this character.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 14.10 only
• Mozilla Firefox: up to and including 35.0.1; version 0.1 only; version 0.2 only; version 0.3 only; version 0.4 only; version 0.5 only; …
• Opensuse Opensuse: version 13.1 only; version 13.2 only

Published 2015-02-25. Last modified 2026-06-17.