High severity7.5NVD Advisory· Published Dec 26, 2022· Updated Jun 17, 2026
CVE-2021-35953
CVE-2021-35953
Description
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.
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Affected products
3- fastrack/Reflex 2.0 W307S_REFLEX_v90.89 Activity Trackerdescription
Patches
Vulnerability mechanics
References
2- payatu.com/advisory/device-crash-fastrack-reflex-two-activity-trackernvdThird Party Advisory
- www.fastrack.in/shop/watch-smart-wearables-reflex-2nvdBroken Link
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