CVE-2026-109571: Fire-Boltt BSW013 firmware through V0.0.8 Unauthenticated Heart Rate Disclosure via BLE

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-12 · updated 2026-10-26
Weakness: CWE-306

Description

Fire-Boltt BSW013 smartwatch firmware through V0.0.8 contains a missing authentication vulnerability that allows unpaired BLE devices to subscribe to the Heart Rate Measurement characteristic (0x2A37). Attackers within Bluetooth range can receive the wearer's live heart rate readings without pairing, bonding, or any confirmation on the watch.

Affected products

Fire-Boltt BSW013: through V0.0.8

References

https://github.com/Pratham-16/fireboltt-Bsw013-BLE-vuln
https://www.vulncheck.com/advisories/fire-boltt-bsw013-firmware-through-v0-0.8-unauthenticated-heart-rate-disclosure-via-ble

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