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CVE-2026-71983 – Unauthenticated OS Command Injection (RCE) – MSI Radix AXE6600 firmware v781521 and

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Summary

CVE-2026-71983 is an unauthenticated OS command injection vulnerability in the MSI Radix AXE6600 router. The flaw resides in the wps.cgi interface, where unsanitized WPS PIN parameters allow a remote attacker to execute arbitrary commands and obtain root privileges. It is rated Critical (CVSS v4.0 9.3 / CVSS v3.1 9.8).

Technical details

  • Root cause: Improper neutralization of special elements used in an OS command (CWE-78). The wps.cgi component incorporates user-supplied input into a system command without adequate sanitization or validation.
  • Trigger conditions: An attacker supplies crafted values in the pin2g, pin5g, or pin6g parameters handled by wps.cgi. No authentication or user interaction is required.
  • Attack vector: Network. The vulnerable interface is reachable remotely over the device’s web management service.
  • Impact: Arbitrary command execution as root, resulting in full compromise of the device.

Affected software

  • MSI Radix AXE6600 router firmware version v781521 and earlier.

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: No official patch was available at the time of public disclosure. Monitor the MSI support portal for updated Radix AXE6600 firmware and apply it as soon as it is released.
  • If no patch: Restrict access to the router’s web management interface so it is not reachable from untrusted networks or the internet, disable WPS if not required, and place the device behind network access controls that limit exposure of the administrative service.

References

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