CVE-2019-11713: Mozilla Firefox

Critical severity, CVSS 9.8. EPSS: 2.1% chance of exploitation in the next 30 days.

A use-after-free vulnerability can occur in HTTP/2 when a cached HTTP/2 stream is closed while still in use, resulting in a potentially exploitable crash. This vulnerability affects Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8.

Affected products

• Mozilla Firefox: before 60.8.0 (fixed in 60.8.0); before 68.0 (fixed in 68.0)
• Mozilla Thunderbird: before 60.8.0 (fixed in 60.8.0)

Published 2019-07-23. Last modified 2026-06-17.