Is CVE-2021-38547 actively exploited?

No active exploitation of CVE-2021-38547 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-38547 be exploited remotely?

Yes. CVE-2021-38547 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-38547?

CVE-2021-38547 has a CVSS score of 5.9 (MEDIUM).

HOME VULNERABILITIESCVE-2021-38547

MEDIUM

CVE-2021-38547

NVD-CWE-noinfoPublished: August 11, 2021· Updated: Jun 17, 2026

5.9

CVSS v3.1

Official Description

Logitech Z120 and S120 speakers through 2021-08-09 allow remote attackers to recover speech signals from an LED on the device, via a telescope and an electro-optical sensor, aka a "Glowworm" attack. The power indicator LED of the speakers is connected directly to the power line, as a result, the intensity of a device's power indicator LED is correlative to the power consumption. The sound played by the speakers affects their power consumption and as a result is also correlative to the light intensity of the LEDs. By analyzing measurements obtained from an electro-optical sensor directed at the power indicator LEDs of the speakers, we can recover the sound played by them.

NVD Source

Technical Analysis

CVE-2021-38547 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.9.