CVE-2020-6828: Mozilla Firefox ESR

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

A malicious Android application could craft an Intent that would have been processed by Firefox for Android and potentially result in a file overwrite in the user's profile directory. One exploitation vector for this would be to supply a user.js file providing arbitrary malicious preference values. Control of arbitrary preferences can lead to sufficient compromise such that it is generally equivalent to arbitrary code execution.<br> *Note: This issue only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox ESR < 68.7.

Affected products

• Mozilla Firefox ESR: before 68.7.0 (fixed in 68.7.0)

Published 2020-04-24. Last modified 2026-06-17.