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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (18.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
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
- www.zerodayinitiative.com/advisories/ZDI-25-251/ (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.