CVE-2016-1963: Mozilla Firefox

High severity, CVSS 7.4. EPSS: 0.3% chance of exploitation in the next 30 days.

The FileReader class in Mozilla Firefox before 45.0 allows local users to gain privileges or cause a denial of service (memory corruption) by changing a file during a FileReader API read operation.

Affected products

• Mozilla Firefox: up to and including 44.0.2

Published 2016-03-13. Last modified 2026-06-17.