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CVE-2026-18614 – Unauthenticated Remote Code Execution – GL.iNet GL-MT3000 (Beryl AX) firmware 4.4.0

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Summary

CVE-2026-18614 is an unauthenticated command injection vulnerability in the GL.iNet GL-MT3000 (Beryl AX) router. A flaw in the s2s.so native plugin allows a remote, unauthenticated attacker to inject operating-system commands through the router’s web management interface, resulting in code execution as root. The issue is rated Critical.

Technical details

  • Root cause: The s2s.enable_echo_server method validates the port argument only by passing it through atoi() for a numeric range check (1–65534). atoi() stops parsing at the first non-digit character, so the original unsanitized string is retained and then passed into snprintf() and system(), allowing shell metacharacters to survive validation.
  • Trigger conditions: An attacker sends a POST request to /cgi-bin/glc invoking the s2s object’s enable_echo_server method with a crafted port argument (e.g. a value combining a valid leading number with appended shell metacharacters). No authentication is required.
  • Attack vector: Network — the vulnerable endpoint is reachable over the device’s HTTP management interface.
  • Impact: Full unauthenticated remote command execution with root privileges, leading to complete compromise of the device.

Affected software

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

Severity

  • 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
  • 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

Mitigation and recommended actions

  • Immediate: Upgrade GL-MT3000 firmware to a fixed release beyond 4.4.5 once published by the vendor; consult GL.iNet security updates for the corresponding patched version.
  • If no patch is available: Do not expose the router’s web management interface to the internet. Restrict access to the management interface (including /cgi-bin/glc) to trusted local networks via firewall rules, and disable remote administration.

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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