CVE-2025-22904
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on RE11S v1.11 devices by exploiting a stack overflow in the pptpUserName parameter of the setWAN function. Attackers can achieve remote code execution with high privileges, affecting all users of this specific firmware version.
💻 Affected Systems
- RE11S
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, credential theft, and use as pivot point for network attacks.
Likely Case
Remote code execution allowing attackers to modify device configuration, intercept network traffic, or install malware.
If Mitigated
Denial of service if exploit fails or crashes device without achieving code execution.
🎯 Exploit Status
Public proof-of-concept code exists on GitHub, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.edimax.com/edimax/global/
Restart Required: Yes
Instructions:
1. Check vendor website for firmware updates. 2. Download latest firmware. 3. Upload via device web interface. 4. Reboot device.
🔧 Temporary Workarounds
Network Segmentation
allIsolate RE11S devices from untrusted networks and restrict access to management interfaces.
Access Control Lists
linuxImplement firewall rules to block external access to device management interfaces.
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
- Replace affected devices with updated models or different vendors
- Implement strict network monitoring and anomaly detection for these devices
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface at System Status > Firmware VersionCheck Version:
curl -s http://device-ip/status.cgi | grep -i firmwareVerify Fix Applied:
Verify firmware version is no longer v1.11 and test setWAN function with malformed pptpUserName input📡 Detection & Monitoring
Log Indicators:
- Unusual setWAN function calls
- Device crash/reboot logs
- Large pptpUserName parameter values
Network Indicators:
- HTTP POST requests to setWAN endpoint with oversized pptpUserName
- Unusual outbound connections from device
SIEM Query:
source="device_logs" AND (uri="/setWAN" AND pptpUserName.length>100)