CVE-2026-2530
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on Wavlink WL-WN579A3 routers by exploiting command injection in the AddMac function. Attackers can manipulate the macAddr parameter in the wireless.cgi endpoint to run system commands. All users of affected Wavlink router versions are at risk.
💻 Affected Systems
- Wavlink WL-WN579A3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing persistent backdoor installation, network traffic interception, lateral movement to connected devices, and botnet recruitment.
Likely Case
Router takeover enabling DNS hijacking, credential theft from network traffic, and deployment of malware to connected devices.
If Mitigated
Limited impact with proper network segmentation, firewall rules blocking WAN access to management interfaces, and regular firmware updates.
🎯 Exploit Status
Public exploit code available on GitHub. Remote exploitation requires no authentication. Simple HTTP request with crafted macAddr parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Vendor did not respond to disclosure. Consider replacing affected devices or implementing workarounds.
🔧 Temporary Workarounds
Block WAN Access to Management Interface
linuxConfigure firewall to block external access to router web interface (ports 80/443)
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable CGI Wireless Management
linuxRemove or restrict access to vulnerable /cgi-bin/wireless.cgi endpoint
mv /www/cgi-bin/wireless.cgi /www/cgi-bin/wireless.cgi.disabled
🧯 If You Can't Patch
- Isolate affected routers in separate VLAN with strict firewall rules
- Implement network monitoring for unusual outbound connections from routers
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at System Status > Firmware VersionCheck Version:
curl -s http://router-ip/ | grep -i firmwareVerify Fix Applied:
Test if /cgi-bin/wireless.cgi endpoint responds to command injection attempts📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /cgi-bin/wireless.cgi with unusual macAddr parameters
- System command execution in router logs
Network Indicators:
- Unusual outbound connections from router IP
- DNS queries to suspicious domains from router
SIEM Query:
source="router-logs" AND uri="/cgi-bin/wireless.cgi" AND (macAddr="*;*" OR macAddr="*|*" OR macAddr="*`*")