CVE-2025-3802
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda W12 and i24 routers allows remote attackers to execute arbitrary code by manipulating the pingIP parameter. This affects devices running specific firmware versions, potentially giving attackers full control over the router. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- Tenda W12
- Tenda i24
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network traffic interception, credential theft, and lateral movement into connected networks.
Likely Case
Router takeover enabling DNS hijacking, man-in-the-middle attacks, and botnet recruitment.
If Mitigated
Limited impact if devices are behind firewalls with strict ingress filtering, though internal network exposure remains.
🎯 Exploit Status
Exploit details are publicly available on GitHub. The vulnerability requires sending a specially crafted HTTP request to the router's web interface.
🛠️ 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 for your model. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router after update.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router web interface
Network Segmentation
allIsolate routers from critical internal networks
🧯 If You Can't Patch
- Replace affected routers with patched or different vendor models
- Implement strict network ACLs to block all inbound traffic to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 3.0.0.4(2887) or 3.0.0.5(3644), device is vulnerable.Check Version:
Login to router web interface and check System Status or Firmware Upgrade sectionVerify Fix Applied:
Verify firmware version has been updated to a version higher than 3.0.0.5(3644) or check Tenda security advisory for fixed versions.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /goform/PingSet endpoint
- Multiple failed ping attempts with malformed IP addresses
- Router crash/restart logs
Network Indicators:
- HTTP traffic to router port 80/443 with unusually long pingIP parameters
- Outbound connections from router to unknown IPs post-exploit
SIEM Query:
source="router_logs" AND (uri="/goform/PingSet" OR message="*pingIP*" OR message="*buffer overflow*")