CVE-2025-30139: An issue was discovered on G-Net Dashcam BB GONX devices

This month

CRITICAL 9.8REMOTEMITIGATE

CVE-2025-30139 is a critical-severity flaw (CVSS 9.8) affecting g-onx firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered on G-Net Dashcam BB GONX devices. Default credentials for SSID cannot be changed. It broadcasts a fixed SSID with default credentials that cannot be changed. This allows any nearby attacker to connect to the dashcam's network without restriction. Once connected, an attacker can sniff on connected devices such as the user's smartphone. The SSID is also always broadcasted.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-1392
Published	2025-03-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: gnetsystem

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

Am I affected?

Timeline

2025-03-18 20:15 UTCPublished CVE record published
2026-06-17 09:08 UTCUpdated Record last modified

gnetsystem g-onx firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

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-2025-30139?

g-onx firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-30139 being exploited?

CVE-2025-30139 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-2025-30139 affect?

CVE-2025-30139 affects g-onx firmware. Severity is critical (CVSS 9.8). An issue was discovered on G-Net Dashcam BB GONX devices. Default credentials for SSID cannot be changed. It broadcasts a fixed SSID with default credentials that cannot be changed. This allows any nearby attacker to connect to the dashcam'

How urgent is CVE-2025-30139?

Priority 48/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-30142 HIGH 8.1 MITIGATE An issue was discovered on G-Net Dashcam BB GONX devices
CVE-2025-30141 HIGH 7.5 MITIGATE An issue was discovered on G-Net Dashcam BB GONX devices
CVE-2025-30140 HIGH 7.5 MITIGATE An issue was discovered on G-Net Dashcam BB GONX devices
CVE-2025-30138 MEDIUM 4.6 MITIGATE An issue was discovered on G-Net Dashcam BB GONX devices

References

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