CVE-2019-11703: libical: Heap buffer over read in icalparser.c parser_get_next_char

Severity: Critical

CVSS Score: 9.8

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.