CVE-2019-11703: Mozilla Thunderbird

Critical severity, CVSS 9.8. EPSS: 10.5% chance of exploitation in the next 30 days.

A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7.1.

Affected products

• Mozilla Thunderbird: before 60.7.1 (fixed in 60.7.1)

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