CVE-2021-35954
HIGHCVSS 8.1/10EPSS 0.33%
Last modified
CVE-2021-35954 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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.. EPSS estimates a 0.33% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Fastrack | Reflex 2.0 Firmware | 90.89 |
References
- https://payatu.com/advisory/dumping-and-re-flashing-firmware-fastrack-reflexThird Party Advisory
- https://www.fastrack.in/shop/watch-smart-wearables-reflex-2Broken Link, Product
- https://payatu.com/advisory/dumping-and-re-flashing-firmware-fastrack-reflexThird Party Advisory
- https://www.fastrack.in/shop/watch-smart-wearables-reflex-2Broken Link, Product
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-35954?
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.
How severe is CVE-2021-35954?
CVE-2021-35954 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.
How do I fix CVE-2021-35954?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-35954?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST