CVE-2026-2529
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on Wavlink WL-WN579A3 routers by exploiting a command injection flaw in the DeleteMac function. Attackers can manipulate the delete_list parameter in the wireless.cgi script to inject malicious 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
Full system compromise allowing attacker to install persistent backdoors, pivot to internal networks, exfiltrate data, or use device as botnet node.
Likely Case
Router takeover enabling DNS hijacking, credential theft, network monitoring, or denial of service attacks.
If Mitigated
Limited impact if device is isolated behind firewalls with strict network segmentation and command execution restrictions.
🎯 Exploit Status
Exploit requires access to the web interface but authentication status is unclear from available information.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
1. Check vendor website for firmware updates
2. If update available, download and verify checksum
3. Access router admin interface
4. Navigate to firmware update section
5. Upload new firmware file
6. Wait for reboot and verify version
🔧 Temporary Workarounds
Disable Web Management Interface
allPrevent access to vulnerable CGI endpoint by disabling web administration
# Configuration varies by router model - check admin interface for disable options
Network Segmentation
linuxIsolate router on separate VLAN with strict firewall rules
# Example iptables rule to restrict access:
iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Segment network to isolate vulnerable devices from critical assets
- Implement strict firewall rules to limit access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 20210219 or earlier, device is vulnerable.Check Version:
Check via web interface at http://router-ip/ or via SSH if availableVerify Fix Applied:
Verify firmware version is newer than 20210219 after update.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed authentication attempts to web interface
- Suspicious CGI parameter values in web logs
Network Indicators:
- Unusual outbound connections from router
- Traffic to unexpected ports
- DNS queries to malicious domains
SIEM Query:
source="router_logs" AND ("wireless.cgi" OR "DeleteMac") AND ("delete_list" OR command injection patterns)