CVE-2021-35954 : fastrack Reflex 2.0 W307S_REFLEX_v90.89 Activity Tracker allows physically proxi

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.

Published 2022-12-26 06:15:11

Updated 2025-04-14 19:15:30

Source MITRE

View at NVD, CVE.org

Products affected by CVE-2021-35954

Fastrack » Reflex 2.0 Firmware » Version: 90.89
cpe:2.3:o:fastrack:reflex_2.0_firmware:90.89:*:*:*:*:*:*:*
Matching versions
When used together with: Fastrack » Reflex 2.0 » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2021-35954

EPSS FAQ

0.03%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 5 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-35954

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source	First Seen
8.1	HIGH	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H	2.8	5.2	134c704f-9b21-4f2e-91b3-4a467353bcc0	2025-04-14
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: High Availability: High
8.1	HIGH	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H	2.8	5.2	NIST
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: High Availability: High

References for CVE-2021-35954

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

Advisory | Payatu
Third Party Advisory
https://www.fastrack.in/shop/watch-smart-wearables-reflex-2

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Vulnerability Details : CVE-2021-35954

Products affected by CVE-2021-35954

Exploit prediction scoring system (EPSS) score for CVE-2021-35954

CVSS scores for CVE-2021-35954

References for CVE-2021-35954