CVE-2026-8229 in NU516U1
Summary
by MITRE • 05/10/2026
A vulnerability was detected in Wavlink NU516U1 240425. The affected element is the function WifiBasic of the file /cgi-bin/wireless.cgi. Performing a manipulation of the argument AuthMethod/EncrypType results in os command injection. Remote exploitation of the attack is possible. The exploit is now public and may be used. The vendor was contacted early about this disclosure.
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Analysis
by VulDB Data Team • 07/24/2026
The vulnerability identified in Wavlink NU516U1 firmware version 240425 represents a critical command injection flaw within the wireless configuration interface. This vulnerability exists in the WifiBasic function of the /cgi-bin/wireless.cgi file, which serves as a critical component for managing wireless network parameters through web-based administration. The flaw specifically manifests when manipulating the AuthMethod and EncrypType parameters, which are used to configure authentication and encryption settings for wireless networks. These parameters are processed without adequate input validation or sanitization, creating an exploitable condition that allows attackers to inject malicious operating system commands directly into the system shell.
The technical nature of this vulnerability aligns with CWE-77 and CWE-94, which categorize command injection and code injection flaws respectively. The vulnerability operates at the intersection of web application security and embedded system security, where user-supplied parameters intended for configuration purposes are directly passed to system execution functions without proper sanitization. This allows attackers to craft malicious inputs that, when processed by the vulnerable function, execute arbitrary commands with the privileges of the web server process. The attack vector is particularly concerning as it enables remote exploitation, meaning an attacker can leverage this vulnerability from outside the network without requiring physical access or prior authentication.
The operational impact of this vulnerability is severe and far-reaching within network infrastructure security. Remote command execution capabilities allow attackers to gain full control over the device's operating system, potentially enabling them to modify network configurations, access sensitive data, install malware, or use the device as a pivot point for attacking other systems within the network. The public availability of exploitation tools increases the likelihood of widespread compromise, as the vulnerability can be exploited by both skilled attackers and automated malware. This particular device serves as a network gateway, making it a prime target for attackers seeking to establish persistent access or conduct man-in-the-middle attacks against connected devices.
Mitigation strategies must address both immediate remediation and long-term security improvements. The vendor should prioritize releasing a firmware update that implements proper input validation and sanitization for all parameters passed to system execution functions. This includes implementing strict parameter validation, using allowlists for acceptable values, and employing proper escaping mechanisms for command execution contexts. Network administrators should consider implementing network segmentation to limit the potential impact of compromise, disable unnecessary wireless services when not required, and monitor network traffic for suspicious command execution patterns. Additionally, implementing web application firewalls and intrusion detection systems can help detect and prevent exploitation attempts. The vulnerability also highlights the importance of secure coding practices and regular security assessments of embedded systems, particularly those handling network configuration parameters that can directly impact system execution. Organizations should also consider implementing zero-trust network architectures that minimize the attack surface and limit the potential impact of such vulnerabilities.