CVE-2021-35954

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-12-26 · updated 2026-06-17

Description

fastrack Reflex 2.0 W307S_REFLEX_v90.89 Activity Tracker allows physically proximate attackers to dump the firmware, flash custom malicious firmware, and brick the device via the Serial Wire Debug (SWD) feature.

Affected products

Fastrack Reflex 2.0 Firmware: 90.89

References

https://payatu.com/advisory/dumping-and-re-flashing-firmware-fastrack-reflex
https://www.fastrack.in/shop/watch-smart-wearables-reflex-2
https://payatu.com/advisory/dumping-and-re-flashing-firmware-fastrack-reflex
https://www.fastrack.in/shop/watch-smart-wearables-reflex-2

Get alerted when CVE-2021-35954 or the next vulnerability affects your stack