CVE-2026-71992 in Radix AXE6600
Summary
by MITRE • 08/09/2026
MSI Radix AXE6600 router firmware version v781521 contains a command injection vulnerability in the macfilter function that allows remote attackers to execute arbitrary commands on the affected device. Attackers can exploit the macfilter function to inject malicious commands and obtain root privileges on the underlying system.
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Analysis
by VulDB Data Team • 08/09/2026
The command injection vulnerability present in MSI Radix AXE6600 router firmware version v781521 represents a critical security flaw that directly compromises the integrity and confidentiality of network infrastructure devices. This vulnerability resides within the macfilter function, which is designed to manage and filter media access control addresses for network access control. The flaw arises from insufficient input validation and sanitization mechanisms that fail to properly handle user-supplied data, creating an avenue for malicious actors to inject arbitrary commands into the system's command execution pipeline.
The technical exploitation of this vulnerability follows a well-established pattern that aligns with CWE-77 and CWE-88 categories, where insufficient neutralization of special elements used in command execution leads to unauthorized code execution. Attackers can leverage the macfilter function by crafting malicious input parameters that bypass normal validation checks and inject shell commands directly into the underlying operating system. This injection occurs because the firmware fails to properly escape or filter special characters such as semicolons, ampersands, or pipe operators that are typically used in command chaining within Unix-like systems. The vulnerability specifically targets the router's embedded Linux environment where command execution is performed through standard shell interfaces.
The operational impact of this vulnerability extends far beyond simple unauthorized access, as successful exploitation grants attackers full root privileges on the affected device. This elevated access level enables comprehensive compromise of the router's functionality, including but not limited to modifying network configurations, establishing persistent backdoors, intercepting network traffic, and potentially using the compromised device as a pivot point for attacking other systems within the local network. The attack surface is particularly concerning given that routers serve as fundamental network gateways, making them prime targets for lateral movement and advanced persistent threat campaigns. This vulnerability directly maps to several ATT&CK techniques including T1059.004 for command and script interpreter, T1068 for exploit for privilege escalation, and T1566 for phishing with malicious attachments or links.
Mitigation strategies must address both immediate remediation and long-term security hardening measures. The most effective immediate solution involves updating to the latest firmware version where the vulnerability has been patched through proper input validation and command execution sanitization. Network administrators should implement network segmentation and access control lists to limit exposure of affected devices, while also establishing monitoring protocols to detect anomalous command execution patterns. Security controls should include disabling unnecessary services, implementing strong authentication mechanisms, and conducting regular vulnerability assessments to identify similar issues in other network infrastructure components. The vulnerability highlights the importance of secure coding practices and proper input validation in embedded systems, particularly those handling user input through web interfaces that may be accessible from untrusted networks. Organizations should also consider implementing network intrusion detection systems capable of identifying command injection attempts and establishing incident response procedures specifically tailored for router compromise scenarios.