Radek Czyz

**Name of the Vulnerable Software and Affected Versions** Firefox versions prior to 52 Thunderbird versions prior to 52 **Description** The issue is related to a networking event listener that can be prematurely released, leading to a null dereference. **Recommendations** For Firefox versions prior to 52, update to version 52 or later. For Thunderbird versions prior to 52, update to version 52 or later.