Junglewise Threat Intelligence

CVE-2026-11406: GL.iNet MT3000 command injection in OpenVPN Client Import Workflow

CVE-2026-11406 · Severity: medium · CVSS 6.3 · Published 2026-06-06

Technologies: GL.iNet MT3000. Vendors: GL.iNet.

Executive brief

A security vulnerability exists in GL.iNet MT3000 routers that allows an authorized user to take full control of the device. By uploading a specially crafted OpenVPN configuration file, an attacker can bypass security filters and execute commands with administrative privileges. This could lead to complete device compromise, unauthorized access to network traffic, or the use of the router as a foothold for further attacks.

Technical details

A command injection vulnerability exists in the OpenVPN client import workflow of GL.iNet MT3000 routers (firmware up to 4.4.5). The issue stems from insufficient validation of uploaded .ovpn configuration files in the 'ovpnclient.sh' script. While the script attempts to filter dangerous directives using 'sed', it only removes a small subset (daemon, dev, dev-type, tun-mtu), leaving over 200 other directives intact. Because the OpenVPN process is subsequently launched with '--script-security 3' as the root user, an authenticated attacker can use directives like 'up', 'down', or 'client-connect' to achieve arbitrary root command execution. A fix is available in firmware version 4.9.0_beta3-1012-0513-1778656146 and later.

Affected products

  • GL.iNet MT3000 (Beryl AX) up to 4.4.5

Timeline

  • 2026-05-06: disclosed: Initial submission by researcher StrTzz123
  • 2026-06-06: advisory: CVE-2026-11406 published

References

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