Improper input validation in Harman Becker Mgu21
CVE-2025-3885
Harman Becker MGU21 Bluetooth Improper Input Validation Denial-of-Service Vulnerability. This vulnerability allows network-adjacent attackers to create a denial-of-service condition on affected installations of Harman Becker MGU21 devices. Authentication is not required to exploit this vulnerability. The specific flaw exists within the Bluetooth stack of the BCM89359 chipset. The issue results from the lack of proper validation of Bluetooth frames. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-23942.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.002 (14.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Harman Becker Mgu21 — versions MGU21_22-07 firmware with BCM89359 wireless chipset; LMP Version: 5.0 (0x9); LMP Subversion: 0x420d
- Samsung Harman_mgu21
- Samsung Harman_mgu21_firmware — versions mgu21_22-07
Weakness classification (CWE)
References
- zdi-disclosures@trendmicro.com (x_research-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-3885?
- CVE-2025-3885 is a medium-severity vulnerability in Harman Becker Mgu21, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2025-05-22.
- How severe is CVE-2025-3885?
- Medium severity. CVSS v3 base score is 6.5 out of 10.