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**Name of the Vulnerable Software and Affected Versions** Mozilla Firefox versions 4.x through 5 SeaMonkey versions 2.x before 2.3 Thunderbird versions before 6 **Description** The issue allows remote attackers to cause a denial of service, resulting in memory corruption and application crash, or possibly execute arbitrary code via unspecified vectors. **Recommendations** For Mozilla Firefox versions 4.x through 5, update to a version outside of this range to resolve the issue. For SeaMonkey versions 2.x before 2.3, update to version 2.3 or later to resolve the issue. For Thunderbird versions before 6, update to version 6 or later to resolve the issue.