CVE-2021-35953: Fastrack Reflex 2.0 Firmware

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

fastrack Reflex 2.0 W307S_REFLEX_v90.89 Activity Tracker allows a Remote attacker to cause a Denial of Service (device outage) via crafted choices of the last three bytes of a characteristic value.

Affected products

• Fastrack Reflex 2.0 Firmware: version 90.89 only

Published 2022-12-26. Last modified 2026-06-17.