CVE-2024-3864: Debian Linux

High severity, CVSS 8.1. EPSS: 0.9% chance of exploitation in the next 30 days.

Memory safety bug present in Firefox 124, Firefox ESR 115.9, and Thunderbird 115.9. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox < 125, Firefox ESR < 115.10, and Thunderbird < 115.10.

Affected products

• Debian Debian Linux: version 10.0 only
• Mozilla Firefox: before 115.10.0 (fixed in 115.10.0); before 125.0 (fixed in 125.0)
• Mozilla Thunderbird: before 115.10.0 (fixed in 115.10.0)

Published 2024-04-16. Last modified 2026-06-17.