CVE-2025-3885: Harman Becker MGU21 Bluetooth Improper Input Validation Denial-of-Service Vulnerability

Routine

MEDIUM 6.5MITIGATE

CVE-2025-3885 is a medium-severity flaw (CVSS 6.5) affecting harman mgu21 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 fram

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-20
Published	2025-05-22
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: samsung

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-22 01:15 UTCPublished CVE record published
2026-06-17 09:20 UTCUpdated Record last modified

samsung harman mgu21 firmware MITIGATE

Affected: mgu21_22-07

Fixed in: no fixed release known

Safe to downgrade to: a release before mgu21_22-07

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-3885?

harman mgu21 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-3885 being exploited?

CVE-2025-3885 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-3885 affect?

CVE-2025-3885 affects harman mgu21 firmware. Severity is medium (CVSS 6.5). 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.

How urgent is CVE-2025-3885?

Priority 28/100. No elevated risk signals yet.

Software pages

Samsung vulnerabilities · Bluetooth vulnerabilities

References

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