Cyber Resilience

CVE-2021-35954

High

Published: 26 December 2022

Published
26 December 2022
Modified
14 April 2025
KEV Added
—
Patch
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CVSS Score v3.1 8.1 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS Score 0.0009 26.4th percentile
Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-35954 is a high-severity an unspecified weakness vulnerability in Fastrack Reflex 2.0 Firmware. Its CVSS base score is 8.1 (High).

Operationally, ranked at the 26.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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.

CWE(s)
NVD-CWE-noinfo

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

fastrack
reflex 2.0 firmware
90.89

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References