CVE-2021-38548: Jbl Go 2 Firmware

Medium severity, CVSS 5.9. EPSS: 1.3% chance of exploitation in the next 30 days.

JBL Go 2 devices 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.

Affected products

• Jbl Go 2 Firmware: up to and including 2021-08-09

Published 2021-08-11. Last modified 2026-06-17.