CVE-2016-5284
7.4
HIGH
CVSS 3.1
EPSS 0.55%
Description
Mozilla Firefox before 49.0, Firefox ESR 45.x before 45.4, and Thunderbird < 45.4 rely on unintended expiration dates for Preloaded Public Key Pinning, which allows man-in-the-middle attackers to spoof add-on updates by leveraging possession of an X.509 server certificate for addons.mozilla.org signed by an arbitrary built-in Certification Authority.
How to fix CVE-2016-5284
To remediate CVE-2016-5284, upgrade the affected package to a fixed version below.
- —upgrade to 45.4.0esr-1 or later
Is CVE-2016-5284 being exploited?
Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 45.4.0esr-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.4 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N |