CVE-2025-57085
📋 TL;DR
This vulnerability in Tenda W30E routers allows attackers to cause a Denial of Service (DoS) by sending specially crafted requests that trigger a stack overflow in the UploadCfg function. The attack exploits improper handling of the v17 parameter, potentially crashing the device and disrupting network services. Anyone using Tenda W30E routers with the vulnerable firmware version is affected.
💻 Affected Systems
- Tenda W30E
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring physical reboot, persistent network outage, and potential remote code execution if the stack overflow can be leveraged for arbitrary code execution (though not confirmed in this CVE).
Likely Case
Router becomes unresponsive, requiring manual reboot to restore functionality, causing temporary network disruption for connected devices.
If Mitigated
If proper network segmentation and access controls are in place, only authorized internal users could trigger the vulnerability, limiting exposure.
🎯 Exploit Status
The GitHub references contain technical details that could be used to create an exploit. The vulnerability requires network access to the router's management interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. Download the latest firmware for W30E. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and install the new firmware. 6. Reboot the router after installation.
🔧 Temporary Workarounds
Restrict Access to Management Interface
linuxBlock external access to the router's web management interface using firewall rules.
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 to prevent external exploitation.
🧯 If You Can't Patch
- Isolate the router on a separate network segment with strict access controls
- Implement network monitoring to detect exploitation attempts and anomalous traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or Firmware Upgrade section.Check Version:
Login to router admin interface and navigate to System Status pageVerify Fix Applied:
Verify firmware version has been updated to a version later than V16.01.0.19 (5037).📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts
- Unusual POST requests to /goform/UploadCfg
- Router crash/reboot logs
Network Indicators:
- Unusual traffic to router management ports (80, 443, 8080)
- Large POST requests to UploadCfg endpoint
SIEM Query:
source="router_logs" AND (uri="/goform/UploadCfg" OR message="crash" OR message="reboot")