Flaw bug created to hold information about an old flaw we knew something about. For more details see the MITRE CVE description.
MITRE description: Integer overflow in Mozilla Thunderbird before 1.5.0.10 and SeaMonkey before 1.0.8 allows remote attackers to trigger a buffer overflow and possibly execute arbitrary code via a text/enhanced or text/richtext e-mail message with an extremely long line.