CVE-2019-17009: Mozilla Firefox

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

When running, the updater service wrote status and log files to an unrestricted location; potentially allowing an unprivileged process to locate and exploit a vulnerability in file handling in the updater service. *Note: This attack requires local system access and only affects Windows. Other operating systems are not affected.*. This vulnerability affects Thunderbird < 68.3, Firefox ESR < 68.3, and Firefox < 71.

Affected products

• Mozilla Firefox: before 71.0 (fixed in 71.0)
• Mozilla Firefox ESR: before 68.3 (fixed in 68.3)
• Mozilla Thunderbird: before 68.3 (fixed in 68.3)
• Opensuse Leap: version 15.1 only

Published 2020-01-08. Last modified 2026-06-17.