CVE-2025-15234
📋 TL;DR
This CVE describes a heap-based buffer overflow vulnerability in Tenda M3 routers version 1.0.0.13(4903). Attackers can remotely exploit this vulnerability by sending specially crafted requests to the /goform/setInternetLanInfo endpoint, potentially leading to arbitrary code execution. Organizations and individuals using affected Tenda M3 routers are at risk.
💻 Affected Systems
- Tenda M3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with root privileges, allowing complete compromise of the router, network traffic interception, lateral movement to connected devices, and persistent backdoor installation.
Likely Case
Router crash/reboot causing denial of service, or limited code execution allowing network reconnaissance and credential harvesting.
If Mitigated
If properly segmented and firewalled, impact limited to router compromise without lateral movement to critical systems.
🎯 Exploit Status
Public exploit code is available, making exploitation trivial for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Wait for router to reboot.
🔧 Temporary Workarounds
Block External Access
linuxConfigure firewall to block external access to router admin interface (typically port 80/443).
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable Remote Management
allTurn off remote management feature in router settings if not required.
🧯 If You Can't Patch
- Segment affected routers in isolated VLAN away from critical systems
- Implement strict network access controls to limit router communication to management networks only
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 1.0.0.13(4903), device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
After firmware update, verify version number has changed from 1.0.0.13(4903).📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/setInternetLanInfo with unusual parameter lengths
- Router crash/reboot logs
- Unusual outbound connections from router
Network Indicators:
- HTTP POST requests to /goform/setInternetLanInfo with oversized portIp/portMask/portGateWay parameters
- Sudden router reboot causing network disruption
SIEM Query:
source="router_logs" AND (url="/goform/setInternetLanInfo" AND content_length>1000)