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CVE-2026-71985 – Unauthenticated OS Command Injection (RCE) – MSI Radix AXE6600 firmware up to v7815

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Summary

CVE-2026-71985 is an unauthenticated OS command injection vulnerability in the accesscontrol function of MSI Radix AXE6600 router firmware. A remote, unauthenticated attacker can send crafted input to this function to execute arbitrary commands with root privileges on the device. The flaw is rated CRITICAL, with published CVSS scores of 9.8 (v3.1) and 9.3 (v4.0).

Technical details

  • Root cause: CWE-78 – improper neutralization of special elements used in an OS command; user-supplied input passed to the accesscontrol function is not adequately sanitized before being used in a system command.
  • Trigger conditions: An attacker submits a specially crafted request to the device’s accesscontrol functionality over the network.
  • Attack vector: Network-based, no authentication required, no user interaction required.
  • Impact: Full compromise of the router, including arbitrary command execution and root-level privileges on the underlying operating system.

Affected software

  • MSI Radix AXE6600 (WiFi 6E Tri-Band Gaming Router) — firmware version v781521 and earlier.

Severity

  • CVSS v3.1: 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: 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 patched firmware has been confirmed as available at time of publication; check MSI’s support page for the Radix AXE6600 for firmware updates addressing this issue and apply as soon as one is released.
  • If no patch: Disable remote/WAN administration access to the router, restrict management interfaces to trusted internal networks only, place the device behind a firewall or VPN to prevent direct internet exposure, and monitor for unexpected outbound connections or configuration changes on affected devices.

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: MSI Router
  • Raw response body: GRAXE66, RadiX AXE6600

References

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Map your entire attack surface (continously)

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4

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Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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