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Unauthenticated Firmware Update in Fastrack Reflex 2.0 Activity Tracker

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Hardware / Firmware Exposure

Unauthenticated Firmware Update in Fastrack Reflex 2.0 Activity Tracker

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…

7.5
/ 10
High
CVSS v3.1
ADVISORY ID
PS48
PUBLISHED
2022-10-04
CVE IDs
CVE-2021-35951
VENDORS
Fastrack
PUBLIC EXPLOIT
None indexed
CWE
PRODUCT
Fastrack Reflex 2.0 Activity Tracker
CVSS VECTOR
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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Summary

Overview

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

Vulnerability details

Vulnerability details

CVE-2021-35951
High | 7.5

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.

Impact:
Denial of service
DISCLOSURE

Disclosure timeline

2020-11-17 reported to the vendor

2021-06-30 CVE was assigned and reserved by MITRE

2022-04-07 No response from the vendor and moving forward to Public disclosure.

References

2026-06-17 (NVD record)

Credits

Shakir zari

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