CVE-2026-2529 Overview
A command injection vulnerability has been discovered in Wavlink WL-WN579A3 routers running firmware versions up to 20210219. The vulnerability exists in the DeleteMac function within the /cgi-bin/wireless.cgi file, where improper handling of the delete_list argument allows attackers to inject and execute arbitrary system commands. This flaw can be exploited remotely by authenticated attackers, potentially leading to complete device compromise.
Critical Impact
Remote attackers with low-level privileges can execute arbitrary commands on the affected router, potentially gaining full control of the device and enabling further network compromise.
Affected Products
- Wavlink WL-WN579A3 Firmware (versions up to 20210219)
- Wavlink WL-WN579A3 Hardware
Discovery Timeline
- 2026-02-16 - CVE-2026-2529 published to NVD
- 2026-02-18 - Last updated in NVD database
Technical Details for CVE-2026-2529
Vulnerability Analysis
This command injection vulnerability (CWE-77) stems from insufficient input validation in the wireless configuration management interface of the Wavlink WL-WN579A3 router. The DeleteMac function processes user-supplied input from the delete_list parameter without proper sanitization, allowing malicious command sequences to be injected and executed within the context of the device's operating system.
The vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component) and CWE-77 (Improper Neutralization of Special Elements used in a Command). The attack can be executed remotely over the network and requires only low-level authentication privileges, making it accessible to any user with basic router access.
Root Cause
The root cause is improper input validation and sanitization in the DeleteMac function within /cgi-bin/wireless.cgi. The function fails to properly neutralize special characters and command sequences in the delete_list parameter before passing it to system command execution routines. This allows attackers to break out of the intended command context and execute arbitrary shell commands.
Attack Vector
The attack is network-based and can be executed remotely against the router's web management interface. An attacker with valid authentication credentials (even low-privilege access) can craft a malicious HTTP request to the /cgi-bin/wireless.cgi endpoint, manipulating the delete_list parameter to include shell metacharacters and arbitrary commands. When the DeleteMac function processes this input, the injected commands are executed with the privileges of the web server process, typically running as root on embedded devices.
For detailed technical information about the vulnerability mechanism, see the GitHub IoT Vulnerability Report.
Detection Methods for CVE-2026-2529
Indicators of Compromise
- Unusual HTTP POST requests to /cgi-bin/wireless.cgi containing shell metacharacters (;, |, &, backticks) in the delete_list parameter
- Unexpected outbound network connections from the router to external hosts
- New or modified files in the router's filesystem that were not created through legitimate administrative actions
- Anomalous processes running on the device that are not part of normal router operations
Detection Strategies
- Implement network intrusion detection rules to monitor for suspicious requests targeting /cgi-bin/wireless.cgi with potentially malicious payloads
- Deploy web application firewall (WAF) rules to filter requests containing command injection patterns in parameter values
- Monitor router logs for unusual authentication patterns followed by wireless.cgi access
Monitoring Recommendations
- Establish baseline network behavior for affected Wavlink devices and alert on deviations
- Configure SIEM rules to correlate multiple failed authentication attempts with subsequent successful access to administrative endpoints
- Implement regular integrity checks on router configuration files to detect unauthorized modifications
How to Mitigate CVE-2026-2529
Immediate Actions Required
- Restrict access to the router's web management interface to trusted internal networks only
- Implement strong, unique credentials for router administration and disable default accounts
- Consider placing affected devices behind a firewall with strict ingress filtering
- Review and audit all user accounts with access to the router's management interface
Patch Information
At the time of disclosure, the vendor (Wavlink) was contacted but did not respond. No official patch is currently available for this vulnerability. Users should monitor the VulDB entry and Wavlink's official channels for any future security updates.
Workarounds
- Disable remote management access to the router's web interface if not required
- Implement network segmentation to isolate affected devices from critical network resources
- Use a VPN for administrative access instead of exposing the management interface directly
- Consider replacing affected devices with products from vendors that provide timely security updates
# Restrict management interface access (if supported by device)
# Access router via local connection and configure:
# 1. Disable WAN-side management access
# 2. Limit LAN-side management to specific IP addresses
# 3. Use HTTPS only for management interface access
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
