CVE-2019-11735: Mozilla Firefox

High severity, CVSS 8.8. EPSS: 1.2% chance of exploitation in the next 30 days.

Mozilla developers and community members reported memory safety bugs present in Firefox 68 and Firefox ESR 68. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 69 and Firefox ESR < 68.1.

Affected products

• Mozilla Firefox: before 69.0 (fixed in 69.0)
• Mozilla Firefox ESR: before 68.1.0 (fixed in 68.1.0)
• Opensuse Leap: version 15.0 only; version 15.1 only

Published 2019-09-27. Last modified 2026-06-17.