TI-2021-14408 Aliases CVE-2021-35954 GHSA-wh39-w6w2-hmvf

fastrack Reflex 2.0 W307S_REFLEX_v90.89 Activity Tracker allows physically proximate…

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

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · High · 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 physically proximate attackers to dump the firmware, flash custom malicious firmware, and brick the device via the Serial Wire Debug (SWD) feature.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00334 26th 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-2021-35954
2026-10-03 Alias added: GHSA-wh39-w6w2-hmvf

References

Advisory 1

https://payatu.com/advisory/dumping-and-re-flashing-firmware-fastrack-reflex

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-2021-14407 fastrack Reflex 2.0 W307S_REFLEX_v90.89 Activity Tracker allows a Remote attacker to… CVSS 3.1HIGH 7.5
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