CVE-2026-18685
Received Received - Intake

Command Injection in GL.iNet GL-MT3000

Publication date: 2026-08-04

Last updated on: 2026-08-04

Assigner: VulDB

Description
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.

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Meta Information

Published
2026-08-04
Last Modified
2026-08-04
Generated
2026-08-04
AI Q&A
2026-08-04
EPSS Evaluated
N/A
NVD
CVE-2026-18685
EUVD
EUVD-2026-52537

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
gl.inet gl-mt3000 to 4.4.5 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-74 The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.
CWE-77 The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

Attack-Flow Graph

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Executive Summary

This vulnerability is a command injection flaw in the GL.iNet GL-MT3000 router up to version 4.4.5. It exists in the set_upgrade function of the file /cgi-bin/glc within the modem.so component. Attackers can remotely exploit this to execute arbitrary commands on the device.

Impact Analysis

This vulnerability allows remote attackers to gain full control of the affected router. They could steal data, install malware, monitor network traffic, or use the device as part of a botnet. Since it is remotely exploitable without authentication, the risk is high for unpatched devices.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA requirements for data protection. Organizations using unpatched GL.iNet GL-MT3000 devices may face compliance violations, legal penalties, and reputational damage due to potential data breaches.

Mitigation Strategies

Immediately update GL.iNet GL-MT3000 to a version beyond 4.4.5 to patch the command injection vulnerability in the modem.so component. If an update is not available, consider disabling remote access to the vulnerable CGI endpoint /cgi-bin/glc or isolate the device from untrusted networks.

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