CVE-2024-4777: Debian Linux

High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days.

Memory safety bugs present in Firefox 125, Firefox ESR 115.10, and Thunderbird 115.10. 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 < 126, Firefox ESR < 115.11, and Thunderbird < 115.11.

Affected products

• Debian Debian Linux: version 10.0 only
• Mozilla Firefox: before 115.11.0 (fixed in 115.11.0); before 126.0 (fixed in 126.0)
• Mozilla Thunderbird: before 115.11.0 (fixed in 115.11.0)

Published 2024-05-14. Last modified 2026-06-17.