CVE-2026-18685

Critical

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.

SeverityCritical

CVSS9.8

Exploit probability—

ProductGl-inet Gl-mt3000 Firmware

PublishedAug 4, 2026

First seenAug 4, 2026

Weakness typeCWE-77Command injection CWE-74Injection

How to fix

Patches

github.com/StrTzz123/iot_vul/tree/main/GL-iNet/MT3000/4.4.5/modem_set_upgrade_glc_rce

Affected products

Product	Affected versions	Fixed in
gl-inet gl-mt3000_firmware	4.4.0, 4.4.1, 4.4.2, 4.4.3, 4.4.4, 4.4.5	—

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