CVE-2025-22916
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on RE11S v1.11 devices via a stack overflow in the PPPoE setup function. Attackers can exploit this by sending specially crafted requests to the pppUserName parameter, potentially gaining full control of affected devices. This affects all systems running the vulnerable RE11S v1.11 firmware.
💻 Affected Systems
- RE11S
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to remote code execution, device takeover, lateral movement within networks, and persistent backdoor installation.
Likely Case
Remote code execution allowing attackers to install malware, steal credentials, or use the device as a pivot point for further attacks.
If Mitigated
Denial of service or limited information disclosure if exploit attempts are blocked by network controls.
🎯 Exploit Status
Public proof-of-concept code exists on GitHub. The vulnerability requires no authentication and has low exploitation complexity due to the stack overflow nature.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.edimax.com/edimax/global/
Restart Required: Yes
Instructions:
1. Check Edimax website for firmware updates. 2. Download latest firmware. 3. Access device web interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot device.
🔧 Temporary Workarounds
Disable PPPoE Interface
allDisable PPPoE functionality if not required to remove attack surface.
Network Segmentation
allIsolate RE11S devices from internet and critical internal networks.
🧯 If You Can't Patch
- Implement strict network access controls to block external access to device management interfaces
- Deploy intrusion prevention systems with signatures for stack overflow exploits
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or SSH. If version is v1.11, device is vulnerable.Check Version:
Check web interface System Status page or use: telnet/ssh to device and check firmware versionVerify Fix Applied:
Verify firmware version has been updated to a version later than v1.11.📡 Detection & Monitoring
Log Indicators:
- Unusual PPPoE setup requests
- Multiple failed authentication attempts on PPPoE interface
- Stack overflow error messages in system logs
Network Indicators:
- Unusual traffic to device management port (typically 80/443)
- HTTP POST requests to PPPoE setup endpoints with long parameter values
SIEM Query:
source_ip="RE11S_IP" AND (http_request LIKE "%formPPPoESetup%" OR error_message LIKE "%stack%overflow%")