---
id: CVE-2021-38365
title: >-
  Winner (aka ToneWinner) desktop speakers through 2021-08-09 allow remote
  attackers to recover speech signals from the power-indicator LED via a
  telescope and an electro-optical sensor, aka a "Glowworm" attack.
summary: >-
  Winner (aka ToneWinner) desktop speakers through 2021-08-09 allow remote
  attackers to recover speech signals from the power-indicator LED via a
  telescope and an electro-optical sensor, aka a "Glowworm" attack.
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'
vendor: tonewinner
product: winner_desktop_speakers_firmware
affected:
  - winner_desktop_speakers_firmware <= 2021-08-09
published: '2021-08-10'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-38365'
references:
  - url: 'https://www.nassiben.com/glowworm-attack'
    label: cve@mitre.org
  - url: 'http://www.tonewinner.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.nassiben.com/glowworm-attack'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.01164
epssPercentile: 0.65926
ingestedAt: '2026-07-06T17:03:23.561Z'
---

## Overview

Winner (aka ToneWinner) desktop speakers through 2021-08-09 allow remote attackers to recover speech signals from the power-indicator LED via a telescope and an electro-optical sensor, aka a "Glowworm" attack.

## Affected

- `winner_desktop_speakers_firmware <= 2021-08-09`

## Remediation

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