An issue was discovered in certain Apple products. macOS before 10.12.2 is affected. The issue involves the "Bluetooth" component. It allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.
Apple Security Advisory 2016-12-13-1 - macOS 10.12.2 is now available and addresses arbitrary code execution, denial of service, and various other vulnerabilities.