TrackR devices through 2020-05-06 allow attackers to trigger the Beep (aka alarm) feature, which will eventually cause a denial of service when battery capacity is exhausted.

TrackR Bravo MAC address can be exposed in close proximity and used to obtain the device ID

The Trackr device ID is constructed of a manufacturer identifier of four zeroes followed by the BLE MAC address in reverse. The MAC address can be obtained by being in close proximity to the Bluetooth device, effectively exposing the device ID. The ID can be used to track devices. Updated apps, version 5.1.6 for iOS and 2.2.5 for Android, have been released by the vendor to address the vulnerabilities in CVE-2016-6538, CVE-2016-6539, CVE-2016-6540 and CVE-2016-6541.