Abillings

**Name of the Vulnerable Software and Affected Versions** Mozilla Firefox versions prior to 21.0 Firefox ESR 17.x versions prior to 17.0.6 Thunderbird versions prior to 17.0.6 Thunderbird ESR 17.x versions prior to 17.0.6 **Description** A use-after-free issue in the `nsContentUtils::RemoveScriptBlocker` function allows remote attackers to execute arbitrary code or cause a denial of service due to heap memory corruption via unspecified vectors. **Recommendations** For Mozilla Firefox versions prior to 21.0, update to version 21.0 or later. For Firefox ESR 17.x versions prior to 17.0.6, update to version 17.0.6 or later. For Thunderbird versions prior to 17.0.6, update to version 17.0.6 or later. For Thunderbird ESR 17.x versions prior to 17.0.6, update to version 17.0.6 or later.

**Name of the Vulnerable Software and Affected Versions** Mozilla Firefox versions prior to 3.6.18 Thunderbird versions prior to 3.1.11 **Description** The issue is related to multiple unspecified vulnerabilities in the browser engine, allowing remote attackers to cause a denial of service, which includes memory corruption and application crash, or possibly execute arbitrary code via unknown vectors. **Recommendations** For Mozilla Firefox versions prior to 3.6.18, update to version 3.6.18 or later. For Thunderbird versions prior to 3.1.11, update to version 3.1.11 or later.