CVE-2026-120277 in WN536AX6-A
Summary
by MITRE • 11/02/2026
A security vulnerability has been detected in WAVLINK WN536AX6-A V260507_2.0.0. This issue affects the function sub_41a1d8 of the file /bin/ioos of the component WireGuard CLI Group Handler. Such manipulation of the argument group_name leads to os command injection. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified in WAVLINK WN536AX6-A V260507_2.0.0 represents a critical security flaw within the WireGuard CLI Group Handler component, specifically located in the sub_41a1d8 function of the /bin/ioos binary file. This issue is classified as an operating system command injection vulnerability, which arises from improper validation and sanitization of user-supplied input data. The specific parameter affected by this flaw is group_name, a variable that accepts string inputs intended to identify network groups within the WireGuard configuration management interface. When processing these inputs, the application fails to adequately filter or escape special characters such as semicolons, ampersands, and pipe symbols before passing them to underlying system shell commands for execution. This lack of rigorous input validation allows an attacker to inject arbitrary operating system commands that are executed with the privileges of the compromised service process.
From a technical perspective, this vulnerability aligns closely with Common Weakness Enumeration (CWE) categories such as CWE-78 Improper Neutralization of Special Elements used in an OS Command and CWE-94 Improper Control of Generation of Code. The root cause lies in the software architecture where dynamic command construction is performed without sufficient boundary checks or context-aware encoding. By manipulating the group_name argument, a remote attacker can bypass intended security controls to execute system-level commands on the device. This type of flaw is particularly dangerous because it transforms what appears to be a standard configuration management function into an arbitrary code execution vector, effectively granting the attacker full control over the affected router's operating environment.
The operational impact of this vulnerability is severe due to its remote exploitability and the public availability of proof-of-concept exploits. Since the WireGuard CLI Group Handler typically runs with elevated privileges necessary for network configuration changes, successful exploitation can lead to complete device compromise. An attacker could use this access to install persistent backdoors, exfiltrate sensitive network data including VPN credentials and private keys, pivot into internal networks protected by the router's firewall, or disrupt service availability through denial-of-service attacks. The fact that exploits have been publicly disclosed significantly lowers the barrier for entry, enabling less sophisticated threat actors to leverage these techniques against unpatched devices in large-scale automated campaigns targeting IoT infrastructure.
Mitigation strategies must address both immediate remediation and long-term security posture improvements. The primary defense is applying vendor-provided firmware updates as soon as they become available, which should include patches that enforce strict input validation on the group_name parameter. In cases where patching is not immediately feasible, network segmentation can help limit lateral movement by isolating IoT devices from critical internal resources. Additionally, disabling unnecessary remote management interfaces and restricting access to administrative ports via firewall rules can reduce the attack surface. For developers involved in similar embedded systems, adopting secure coding practices such as using parameterized commands instead of string concatenation for shell execution is essential to prevent future occurrences of command injection flaws. Continuous monitoring for anomalous network traffic patterns associated with known exploit signatures can also aid in early detection and response efforts.