Iain Ireland

**Name of the Vulnerable Software and Affected Versions** Firefox versions prior to 77 Firefox ESR versions prior to 68.9.0 Thunderbird versions prior to 68.9.0 **Description** A missing type check during unboxed objects removal can result in a crash and potentially be exploited to run arbitrary code. The issue is related to a lack of authentication data verification mechanism in the unpacking module of the affected browsers and email client. This could allow a remote attacker to access confidential data, compromise its integrity, and cause a denial of service. **Recommendations** For Firefox versions prior to 77, update to version 77 or later. For Firefox ESR versions prior to 68.9.0, update to version 68.9.0 or later. For Thunderbird versions prior to 68.9.0, update to version 68.9.0 or later.

**Name of the Vulnerable Software and Affected Versions** Firefox versions prior to 70 Firefox ESR versions prior to 68.2 Thunderbird versions prior to 68.2 **Description** The issue is related to memory safety bugs, including evidence of memory corruption, which could potentially be exploited to run arbitrary code. This could allow a remote attacker to access confidential data, compromise its integrity, and cause a denial of service. The estimated number of potentially affected devices worldwide is not specified. **Recommendations** For Firefox versions prior to 70, update to version 70 or later. For Firefox ESR versions prior to 68.2, update to version 68.2 or later. For Thunderbird versions prior to 68.2, update to version 68.2 or later.