CVE-2022-22751: Mozilla Firefox

High severity, CVSS 8.8. EPSS: 0.9% chance of exploitation in the next 30 days.

Mozilla developers Calixte Denizet, Kershaw Chang, Christian Holler, Jason Kratzer, Gabriele Svelto, Tyson Smith, Simon Giesecke, and Steve Fink reported memory safety bugs present in Firefox 95 and Firefox ESR 91.4. 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 ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.

Affected products

• Mozilla Firefox: before 96.0 (fixed in 96.0)
• Mozilla Firefox ESR: before 91.5 (fixed in 91.5)
• Mozilla Thunderbird: before 91.5 (fixed in 91.5)

Published 2022-12-22. Last modified 2026-06-17.