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CVE-2026-71992 – Unauthenticated OS Command Injection (RCE) – MSI Radix AXE6600 firmware up to and i

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Summary

CVE-2026-71992 is an unauthenticated OS command injection vulnerability (CWE-78) in the MSI Radix AXE6600 router. The flaw resides in the device’s macfilter function and allows a remote attacker to execute arbitrary operating system commands with root privileges. It is rated Critical (CVSS v4.0 9.3 / CVSS v3.1 9.8).

Technical details

  • Root cause: The macfilter function fails to properly neutralize special elements in user-supplied input before passing it to a system command (CWE-78), allowing shell metacharacters to chain arbitrary commands.
  • Trigger conditions: Exploitation requires no authentication and no user interaction; a crafted request to the vulnerable macfilter function is sufficient.
  • Attack vector: Network (remote), low attack complexity.
  • Impact: Full compromise of the device — arbitrary command execution with root-level privileges, with high impact to confidentiality, integrity, and availability.

Affected software

  • MSI Radix AXE6600 router firmware version v781521 and all earlier versions.

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 the MSI Radix AXE6600 to firmware version v782418 or later, available from the MSI support portal.
  • If no patch can be applied: Restrict access to the router’s management interface to trusted networks and users, and ensure the device is not exposed directly to the internet.

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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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

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By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

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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