G-onx Firmware: Use of Default Credentials
CVE-2025-30139 is a critical-severity use of default credentials vulnerability in G-onx Firmware from Gnetsystem, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 0.42% chance of exploitation within 30 days, which is low compared with other CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Check which version of G-onx Firmware you run against the affected versions below, and install the vendor's latest release.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Gnetsystem | G-onx Firmware | Not specified in the record | Not stated |
Version data comes from NVD's product matching. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CISA (ADP).
Official description
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.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Use of Default Credentials
The product uses default credentials (such as passwords or cryptographic keys) for potentially critical functionality.
How developers prevent this class of flaw
- Prohibit use of default, hard-coded, or other values that do not vary for each installation of the product - especially for separate organizations.
- Force the administrator to change the credential upon installation.
- The product administrator could change the defaults upon installation or during operation.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- github.com/geo-chen/GNETThird Party Advisory
Other references
Other vulnerabilities in G-onx Firmware
- 7.5 High severity
- 8.1 High severity
- 7.5 High severity
Recent Use of Default Credentials vulnerabilities
- 7.2 High severity
- 7.5 High severity
- 7.6 High severity
- 7.5 High severity
- 9.8 Critical severity
- 7.5 High severity
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