CVE-2021-35952: fastrack Reflex 2.0 W307S_REFLEX_v90.89 Activity Tracker allows a Remote attacker to change the time, date, an

Routine

MEDIUM 5.3REMOTEMITIGATE

CVE-2021-35952 is a medium-severity flaw (CVSS 5.3) affecting reflex 2.0 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

fastrack Reflex 2.0 W307S_REFLEX_v90.89 Activity Tracker allows a Remote attacker to change the time, date, and month via Bluetooth LE Characteristics on handle 0x0017.

Why this priority

Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Published	2022-12-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fastrack

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-12-26 06:15 UTCPublished CVE record published
2026-06-17 03:57 UTCUpdated Record last modified

fastrack reflex 2.0 firmware MITIGATE

Affected: 90.89

Fixed in: no fixed release known

Safe to downgrade to: a release before 90.89

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-35952?

reflex 2.0 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-35952 being exploited?

CVE-2021-35952 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-35952 affect?

CVE-2021-35952 affects reflex 2.0 firmware. Severity is medium (CVSS 5.3). fastrack Reflex 2.0 W307S_REFLEX_v90.89 Activity Tracker allows a Remote attacker to change the time, date, and month via Bluetooth LE Characteristics on handle 0x0017.

How urgent is CVE-2021-35952?

Priority 36/100. Remotely exploitable, no login, no user action

Software pages

Bluetooth vulnerabilities

Related CVEs

CVE-2021-35954 HIGH 8.1 MITIGATE fastrack Reflex 2.0 W307S_REFLEX_v90.89 Activity Tracker allows physically proximate attackers to dump the fir
CVE-2021-35953 HIGH 7.5 MITIGATE fastrack Reflex 2.0 W307S_REFLEX_v90.89 Activity Tracker allows a Remote attacker to cause a Denial of Service
CVE-2021-35951 HIGH 7.5 MITIGATE fastrack Reflex 2.0 W307S_REFLEX_v90.89 Activity Tracker allows an Unauthenticated Remote attacker to send a m

References

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