---
id: CVE-2026-109571
title: >-
  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)
summary: >-
  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 ca…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-306
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T21:17:13.960'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109571'
references:
  - url: 'https://github.com/Pratham-16/fireboltt-Bsw013-BLE-vuln'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/fire-boltt-bsw013-firmware-through-v0-0.8-unauthenticated-heart-rate-disclosure-via-ble
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-12T22:05:40.362Z'
vendor: Fire-Boltt
product: BSW013
affected:
  - BSW013 <= V0.0.8
epss: 0.00177
epssPercentile: 0.07196
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-26T16:37:03.827102Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.