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CVE-2026-71988 – Unauthenticated Remote Command Injection (RCE) – MSI Radix AXE6600 firmware v781521

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Summary

CVE-2026-71988 is an OS command injection vulnerability (CWE-78) in the MSI Radix AXE6600 Wi-Fi 6E gaming router. A remote, unauthenticated attacker can execute arbitrary commands with root privileges on affected devices, making this a critical-severity issue (CVSS v3.1 9.8 / CVSS v4.0 9.3).

Technical details

  • Root cause: Improper neutralization of special elements used in an OS command (CWE-78) within the router’s portFw function, which fails to sanitize attacker-supplied input before it is passed to a system command.
  • Trigger conditions: The vulnerable portFw code path is reached through the alg function; no authentication or user interaction is required.
  • Attack vector: Network — the flaw is remotely exploitable over the network with low attack complexity.
  • Impact: Successful exploitation allows execution of arbitrary commands, leading to full device compromise with root privileges (high impact to confidentiality, integrity, and availability).

Affected software

  • MSI Radix AXE6600 router firmware version v781521 and earlier (version 0 through v781521).

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: Update affected devices to MSI Radix AXE6600 firmware version v782418 or later, available from the official MSI support portal.
  • If no patch can be applied: Restrict network access to the router’s management interface, ensure it is not exposed to the internet, and place the device behind network segmentation or firewall controls until the firmware update is applied.

References

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