CVE-2026-71990 in Radix AXE6600
Summary
by MITRE • 08/09/2026
MSI Radix AXE6600 router firmware version v781521 contains a command injection vulnerability in the TelnetSSH function used for SSH configuration that allows remote attackers to execute arbitrary commands on the affected device. Attackers can exploit this vulnerability through the SSH configuration interface to inject malicious commands and obtain root privileges on the underlying system.
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Analysis
by VulDB Data Team • 08/09/2026
This vulnerability represents a critical command injection flaw in the MSI Radix AXE6600 router firmware version v781521 that resides within the TelnetSSH function responsible for SSH configuration management. The flaw allows remote attackers to execute arbitrary commands on the affected device by injecting malicious payloads through the SSH configuration interface, effectively bypassing normal security controls and gaining unauthorized access to the underlying system.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization within the TelnetSSH function, which processes user-supplied parameters without proper escaping or filtering mechanisms. This allows attackers to inject command sequences that are then executed by the system shell, creating a pathway for privilege escalation and complete system compromise. The vulnerability falls under the CWE-77 category of Command Injection, where user-controllable data is directly incorporated into shell commands without adequate sanitization.
From an operational perspective, this vulnerability presents a severe risk to network security infrastructure as it enables remote code execution with root privileges, effectively granting attackers full control over the router's functionality. The impact extends beyond simple command execution to include potential denial of service conditions, data exfiltration, and use as a pivot point for further attacks within the network. Attackers can leverage this vulnerability to establish persistent backdoors, modify firewall rules, or redirect traffic through malicious proxy configurations.
The attack surface for this vulnerability is particularly concerning given that it affects the SSH configuration interface, which is typically exposed to remote networks and commonly used for legitimate administrative access. This creates a scenario where attackers can exploit the vulnerability without requiring physical access or specialized credentials, making it highly attractive for automated exploitation campaigns. The vulnerability aligns with ATT&CK technique T1059.001 for Command and Scripting Interpreter, specifically targeting the command shell execution capabilities of the affected device.
Mitigation strategies should focus on immediate firmware updates from MSI to address the identified command injection flaw, along with implementing network segmentation to limit exposure of administrative interfaces to trusted networks only. Network monitoring solutions should be configured to detect unusual command execution patterns and unauthorized access attempts to SSH configuration endpoints. Additionally, administrators should disable unnecessary services, implement strong authentication mechanisms, and regularly audit router configurations to prevent exploitation of similar vulnerabilities in the future. The vulnerability demonstrates the importance of secure coding practices and input validation in network infrastructure devices, emphasizing the need for comprehensive security testing throughout the software development lifecycle.