TI-2021-14407 Aliases CVE-2021-35953 GHSA-vfmg-gwh5-c67f

fastrack Reflex 2.0 W307S_REFLEX_v90.89 Activity Tracker allows a Remote attacker to…

LOW 35Published 2022-12-26 · Updated 2025-04-14

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00895 59th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:fastrack:reflex_2.0_firmware:90.89:::::::*	90.89	Vulnerable	Fastrack
cpe:2.3:h:fastrack:reflex_2.0:-:::::::*	not specified by NVD	Running on	Fastrack

cpe:2.3:o:fastrack:reflex_2.0_firmware:90.89:*:*:*:*:*:*:* Versions 90.89 Vulnerable ·Fastrack
cpe:2.3:h:fastrack:reflex_2.0:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Fastrack

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-35953
2026-10-03 Alias added: GHSA-vfmg-gwh5-c67f

References

Advisory 1

https://payatu.com/advisory/device-crash-fastrack-reflex-two-activity-tracker

Other 1

https://www.fastrack.in/shop/watch-smart-wearables-reflex-2

TI-2021-14405 fastrack Reflex 2.0 W307S_REFLEX_v90.89 Activity Tracker allows an Unauthenticated Remote… CVSS 3.1HIGH 7.5
TI-2021-14408 fastrack Reflex 2.0 W307S_REFLEX_v90.89 Activity Tracker allows physically proximate… CVSS 3.1HIGH 8.1
TI-2021-14406 fastrack Reflex 2.0 W307S_REFLEX_v90.89 Activity Tracker allows a Remote attacker to… CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences