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Case File

CVE-2016-5284

HIGH · CVSS 7.4 EPSS 2.37%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2016-09-22 · Last synced 2026-08-04

Field Assessment

AI analysis pending.

CVE
CVE-2016-5284
Severity
HIGH
CVSS
7.4
EPSS
2.37%
Firefox

Original Filing — NVD 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.