CVE-2026-109108 in WL-WN530BE1-A
Summary
by MITRE • 10/13/2026
A security vulnerability has been detected in Wavlink WL-WN530BE1-A 251117. This affects the function popen of the file /cgi-bin/uploadVpn.cgi. Such manipulation of the argument Type leads to os command injection. The attack may be performed from remote. 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 • 10/13/2026
The Wavlink WL-WN530BE1-A router, specifically firmware version 251117, contains a critical security flaw within its web management interface that allows for remote code execution through command injection. This vulnerability is located in the uploadVpn.cgi script, which handles VPN configuration uploads and related administrative tasks. The core of the issue lies in the improper handling of user-supplied input passed to the popen function via the Type parameter. When a request is made to this endpoint, the system fails to adequately sanitize or validate the data before passing it to the operating system shell for execution. This lack of rigorous input validation creates an opening for attackers to inject arbitrary commands that will be executed with the privileges of the web server process, which often includes root-level access on embedded Linux devices like routers.
From a technical perspective, this is a classic instance of OS Command Injection, categorized under CWE-78 in the Common Weakness Enumeration standard. The popen function executes a command by passing it to /bin/sh -c, meaning any shell metacharacters present in the Type argument are interpreted directly by the system shell rather than being treated as literal string data. An attacker can exploit this by crafting a malicious HTTP request where the Type parameter contains not just valid configuration values but also injected commands separated by delimiters such as semicolons or pipes. Because the vulnerability is accessible via the web interface, it falls under the Remote Code Execution (RCE) category and aligns with MITRE ATT&CK technique T1059, specifically command and scripting interpreter execution. The fact that this exploit has been publicly disclosed indicates that proof-of-concept code exists, significantly lowering the barrier to entry for malicious actors who may not possess advanced exploitation skills but can leverage existing tools to compromise vulnerable devices.
The operational impact of this vulnerability is severe due to the nature of network infrastructure hardware. A successful attack allows an adversary to gain full control over the router's operating system. This compromises the confidentiality, integrity, and availability of all traffic passing through the device. Attackers can redirect DNS queries to malicious servers for phishing or malware distribution, intercept sensitive data such as login credentials and financial information, or use the compromised device as a pivot point to attack other systems on the local network. Furthermore, because routers often serve as gateways between trusted internal networks and untrusted external networks, compromising one unit can lead to widespread lateral movement within an organization's infrastructure. The persistence of this vulnerability in publicly disclosed exploits suggests that automated scanning tools are likely already probing for this specific signature across the internet, increasing the risk of opportunistic attacks even if no targeted campaign is underway against a specific victim.
Mitigation strategies must address both immediate remediation and long-term security hygiene. The primary defense is to apply the vendor's latest firmware update as soon as it becomes available, which should include patches for this command injection flaw in uploadVpn.cgi. Until an official patch is released or installed, administrators should restrict access to the router's web management interface by placing it behind a VPN connection rather than exposing it directly to the internet. Additionally, implementing strict firewall rules that limit inbound traffic on ports 80 and 443 only from trusted IP addresses can reduce the attack surface significantly. Network segmentation is also recommended to isolate IoT devices like routers from critical internal servers and workstations, thereby limiting the blast radius in case of a compromise. Regular monitoring for unusual outbound connections or changes in DNS settings can help detect exploitation attempts early. Ultimately, this incident underscores the importance of rigorous input validation practices during software development and the necessity of keeping embedded systems updated to protect against known vulnerabilities that have already been weaponized by threat actors.