VulnerabilityModified

CVE-2015-0832

(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.

MEDIUM 5.0EPSS 1.31%

Does this matter?

Lower severity and a low EPSS score (1.31%). Track it; it rarely justifies an emergency change on its own.

Description

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.

CVSS 2.0: 5.0 MEDIUMAV:N/AC:L/Au:N/C:N/I:P/A:N
EPSS: 1.31% probability · 70th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-254
Affected: opensuse/opensuse · canonical/ubuntu linux · mozilla/firefox
Source: security@mozilla.org

EPSS trend

EPSS 1.3% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.