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**Name of the Vulnerable Software and Affected Versions** macOS versions prior to 10.12.1 **Description** The issue involves the `ATS` component and allows remote attackers to execute arbitrary code or cause a denial of service, resulting in memory corruption and application crash, via a crafted font. This is caused by a buffer overflow in memory. **Recommendations** For macOS versions prior to 10.12.1, update to version 10.12.1 or later to resolve the issue. As a temporary workaround, consider restricting the use of the `ATS` component until a patch is available. Avoid using crafted fonts in affected systems to minimize the risk of exploitation.