Vulnerability Instance

Mozilla developers identified and fixed several stability bugs in the
browser engine used in Firefox and other Mozilla-based products. Some of
these crashes showed evidence of memory corruption under certain
circumstances and we presume that with enough effort at least some of these
could be exploited to run arbitrary code.Thunderbird shares the browser engine with Firefox and could
be vulnerable if JavaScript were to be enabled in mail. This is not the
default setting and we strongly discourage users from running JavaScript in
mail. Without further investigation we cannot rule out the possibility that
for some of these an attacker might be able to prepare memory for exploitation
through some means other than JavaScript such as large images.