Executive brief
A security vulnerability has been identified in the GL.iNet GL-MT3000 router, a device used for providing wireless networking and VPN services. An attacker could remotely execute unauthorized commands on the router by manipulating FTP configuration settings. This could lead to a complete takeover of the device, allowing the attacker to intercept network traffic or disrupt internet connectivity. Users are advised to upgrade to firmware version 4.8.1 to resolve this issue.
Technical details
A command injection vulnerability exists in the GL.iNet GL-MT3000 firmware version 4.4.5 within the FTP Protocol Handler component. The flaw is located in the /cgi-bin/glc file, specifically involving the improper use of snprintf when handling the media_dir argument. An attacker can exploit this by injecting shell metacharacters (such as semicolons and single quotes) into the media_dir parameter, which is subsequently processed by the system without adequate sanitization. This allows for remote, unauthenticated command execution. The vendor has addressed this in version 4.8.1 by implementing the escape_single_quote() function to neutralize malicious payloads before they are written to the FTP configuration.
Affected products
- GL.iNet GL-MT3000 4.4.5
Timeline
- 2026-06-07: advisory: NVD published the CVE record
- 2026-06-07: disclosed: Vulnerability details released by VulDB