Unauthenticated Firmware Update
It was identified on analyzing the Bluetooth LE Characteristics of the device that it is using Nordic DFU 0.1 and has no signature verification for OTA Firmware Update. An attacker can send a malicious firmware and brick the device
Fastrack Reflex 2.0 Activity Tracker
17 Nov 2020 reported to the vendor
30th June 2021 CVE was assigned and reserved by MITRE
7 April 2022 No response from the vendor and moving forward to Public disclosure.