CVE-2026-36734 in BR-6428nS V3
Summary
by MITRE • 05/11/2026
EDIMAX BR-6428nS V3 1.15 is vulnerable to Command Injection. An authenticated attacker with access to the network can submit crafted input to the WLAN configuration functionality. Due to insufficient input validation, the attacker is able to execute arbitrary system commands on the device.
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Analysis
by VulDB Data Team • 05/12/2026
The EDIMAX BR-6428nS V3 1.15 wireless router presents a critical command injection vulnerability that stems from inadequate input validation within its WLAN configuration interface. This vulnerability exists in the device's web-based management system where user-supplied parameters are not properly sanitized before being processed by the underlying operating system. The flaw allows an authenticated attacker who has network access to inject malicious commands that are subsequently executed with the privileges of the web server process, typically root or administrator level access. The vulnerability specifically manifests when the device processes configuration parameters submitted through the WLAN settings functionality, where input fields for network parameters such as SSID, password, or DNS settings are not adequately validated or escaped. This command injection weakness enables attackers to execute arbitrary system commands on the affected device, potentially leading to complete system compromise and unauthorized access to the local network. The vulnerability represents a significant security risk as it allows attackers to gain persistent access to the device and potentially use it as a pivot point for attacking other systems within the network. According to the CWE database, this corresponds to CWE-77 which describes improper neutralization of special elements used in a command inside a comand injection vulnerability. The attack surface is further expanded by the fact that the vulnerability requires only network access and authentication, making it particularly dangerous as it can be exploited by attackers who have gained access to the local network but lack direct administrative credentials.
The operational impact of this command injection vulnerability extends beyond simple unauthorized command execution to encompass complete system compromise and potential network infiltration. An attacker who successfully exploits this vulnerability can gain access to sensitive network configuration data, modify routing tables, establish backdoors, or redirect network traffic through the compromised device. The vulnerability's persistence is particularly concerning as the compromised device can serve as a long-term foothold for attackers to conduct reconnaissance, data exfiltration, or launch further attacks against other networked systems. The affected device's architecture, which likely employs a standard embedded operating system with minimal input validation controls, makes it particularly susceptible to this type of attack. Network traffic passing through the compromised router can be intercepted or modified, potentially enabling man-in-the-middle attacks or DNS poisoning. The vulnerability also presents a risk for privilege escalation attacks where attackers can leverage the command injection to execute administrative commands that modify system files or install malicious software. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1059.001 (Command and Scripting Interpreter: PowerShell) and T1068 (Exploitation for Privilege Escalation) as attackers can leverage the device's command execution capabilities to escalate their access level and maintain persistence.
Mitigation strategies for this command injection vulnerability must address both immediate remediation and long-term security hardening measures. The most effective immediate solution involves applying vendor-provided firmware updates that implement proper input validation and sanitization for all user-supplied parameters. Network administrators should ensure that all devices in the network are updated to the latest firmware versions that address this specific vulnerability. Additional mitigations include implementing network segmentation to limit access to administrative interfaces, configuring firewall rules to restrict access to the device's web management interface, and disabling unnecessary services or features that may contribute to the attack surface. Access controls should be strengthened through the implementation of multi-factor authentication and the use of strong, unique passwords for all administrative accounts. Network monitoring solutions should be deployed to detect anomalous command execution patterns or unusual network traffic that may indicate exploitation attempts. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other network devices. The device should be configured to use secure protocols such as HTTPS for management access and to disable unnecessary services that may provide additional attack vectors. Network administrators should also implement logging and alerting mechanisms to detect unauthorized configuration changes or command execution attempts. According to industry best practices, this vulnerability should be addressed through a comprehensive security patch management program that includes regular firmware updates and security assessments to prevent similar issues from arising in the future. The vulnerability also underscores the importance of input validation and proper sanitization techniques as recommended in the OWASP Top Ten and other security frameworks, emphasizing that all user inputs should be treated as potentially malicious and properly escaped or validated before processing.