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CVE-2026-18616 – Unauthenticated Command Injection (RCE) – GL.iNet GL-MT3000 firmware 4.4.0 through

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Summary

CVE-2026-18616 is an unauthenticated OS command injection vulnerability in the GL.iNet GL-MT3000 (Beryl AX) travel router. The flaw resides in the wg-server native plugin exposed through the /cgi-bin/glc interface and allows a remote, unauthenticated attacker to execute arbitrary commands as root. It is rated Critical (CVSS v4.0 9.3 / CVSS v3.1 9.8).

Technical details

  • Root cause: The wg-server.set_peer method (in /usr/lib/oui-httpd/rpc/wg-server.so) builds a shell command with sprintf() using the fixed template wg set wgserver peer %s allowed-ips %s persistent-keepalive 25 2>/dev/null. The attacker-supplied public_key value is inserted without shell metacharacter escaping or validation and the result is passed to system().
  • Trigger conditions: An HTTP POST request to /cgi-bin/glc invoking server.set_peer with a public_key value containing shell metacharacters (for example command substitution $(...)). The /cgi-bin/glc binary loads and invokes these plugin methods via dlopen()/dlsym() without any authentication check.
  • Attack vector: Network — no authentication and no user interaction required.
  • Impact: Arbitrary command execution with root privileges, leading to full compromise of the device (confidentiality, integrity, and availability).

Affected software

  • GL.iNet GL-MT3000 (Beryl AX) firmware versions 4.4.0 through 4.4.5.

Severity

  • CVSS v3.1 base score: 9.8 (Critical) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CVSS v4.0 base score: 9.3 (Critical) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade GL-MT3000 firmware beyond the affected 4.4.x branch to the latest release published on the GL.iNet security updates page.
  • If no patch can be applied immediately: Restrict access to the router’s administrative/HTTP interface so it is not reachable from the internet or untrusted networks (e.g., disable remote/WAN-side management and place the management interface behind a firewall or VPN), reducing exposure of the /cgi-bin/glc endpoint.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Page title: GL.iNet, GL-MT3000, Beryl AX, GL.iNet Admin Panel

References

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