CVE-2022-34484: Mozilla Firefox

High severity, CVSS 8.8. EPSS: 1% chance of exploitation in the next 30 days.

The Mozilla Fuzzing Team reported potential vulnerabilities present in Thunderbird 91.10. 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 < 102, Firefox ESR < 91.11, Thunderbird < 102, and Thunderbird < 91.11.

Affected products

• Mozilla Firefox: before 102.0 (fixed in 102.0)
• Mozilla Firefox ESR: before 91.11 (fixed in 91.11)
• Mozilla Thunderbird: before 91.11 (fixed in 91.11)

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