Mozilla Firefox and Thunderbird 1.x before 1.5.0.2 and 1.0.x before 1.0.8, Mozilla Suite before 1.7.13, and SeaMonkey before 1.0.1 allows remote attackers to execute arbitrary code via "an invalid and non-sensical ordering of table-related tags" that results in a negative array index.
Exploitability
AV:NAC:MAu:NImpact
C:CI:CA:C9.3/AV:N/AC:M/Au:N/C:C/I:C/A:C