CVE-2021-38544

MEDIUM
5.9
CVSS Score
Published: August 11, 2021 at 03:25 PM UTC
Updated: June 17, 2026 at 04:02 AM UTC
4 products affected across 1 vendorSrs XB43 FirmwareSrs XB33 FirmwareSrs-Xb33

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Severity
MEDIUM5.9
Exploit prediction
EPSS 1%

Description

Sony SRS-XB33 and SRS-XB43 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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≤ 2021-08-09
sony-srs-xb33 (same device)
v ≤ 2021-08-09
sony-srs-xb43 (same device)
All versions
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_MISCExploitThird Party Advisory
https://www.nassiben.com/glowworm-attack

CVSS

Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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