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8.9
CVE-2026-18685: GL.iNet GL-MT3000 modem upgrade command can be exploited
CVE-2026-18685 · published 1 month ago
Summary
The GL.iNet GL-MT3000 modem has a vulnerability that allows attackers to execute unauthorized commands when upgrading the modem's software. This can be done remotely, which means it's a potential risk for users with the modem connected to the internet. It's recommended that users update their modem's software to the latest version to fix this issue.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| gl.inet | gl-mt3000 | 4.4.0 |
Original advisory text
A security vulnerability has been detected in GL.iNet GL-MT3000 up to 4.4.5. Impacted is the function set_upgrade of the file /cgi-bin/glc of the component modem.so. Such manipulation leads to comm...
A security vulnerability has been detected in GL.iNet GL-MT3000 up to 4.4.5. Impacted is the function set_upgrade of the file /cgi-bin/glc of the component modem.so. Such manipulation leads to command injection. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure and confirmed the existence of the vulnerability.
References
- https://vuldb.com/vuln/385611 vdb-entry technical-description
- https://vuldb.com/vuln/385611/cti signature permissions-required
- https://vuldb.com/cve/CVE-2026-18685 third-party-advisory
- https://vuldb.com/submit/851593 third-party-advisory
- https://github.com/StrTzz123/iot_vul/tree/main/GL-iNet/MT3000/4.4.5/modem_set_up... exploit patch
Severity
8.9
High
CVSS 3.1: 9.8 (MITRE)
Exploitation
EPSS 4%
Type
CWE-77Command Injection
CWE-74Injection
Timeline
Published4 Aug 2026
Updated25 Sep 2026
First seen3 Aug 2026
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