CVE-2024-11699: Mozilla Firefox

High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days.

Memory safety bugs present in Firefox 132, Firefox ESR 128.4, and Thunderbird 128.4. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 133, Firefox ESR < 128.5, Thunderbird < 133, and Thunderbird < 128.5.

Affected products

• Mozilla Firefox: before 128.5.0 (fixed in 128.5.0); before 133.0 (fixed in 133.0)
• Mozilla Thunderbird: before 128.5 (fixed in 128.5); from 129.0, before 133.0 (fixed in 133.0)

Published 2024-11-26. Last modified 2026-06-17.