CVE-2025-25510
📋 TL;DR
A buffer overflow vulnerability in Tenda AC8 routers allows attackers to execute arbitrary code or cause denial of service by sending specially crafted requests to the get_parentControl_list_Info function. This affects Tenda AC8 router users running vulnerable firmware versions. Successful exploitation could lead to complete router compromise.
💻 Affected Systems
- Tenda AC8
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full router compromise, credential theft, network pivoting, and persistent backdoor installation.
Likely Case
Router crash/reboot causing denial of service, potentially requiring physical reset to restore functionality.
If Mitigated
Limited impact if router is behind firewall with restricted WAN access and updated firmware.
🎯 Exploit Status
Exploitation requires authentication to the router's web interface. The GitHub reference contains detailed analysis and proof-of-concept code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware for AC8 model. 3. Log into router web interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Wait for router to reboot.
🔧 Temporary Workarounds
Disable Parental Control Feature
allDisable the parental control functionality to prevent access to the vulnerable function.
Log into router web interface > Parental Control > Disable
Restrict Web Interface Access
allLimit access to router management interface to trusted IP addresses only.
Log into router > Advanced > Security > Access Control > Enable IP/MAC Filtering
🧯 If You Can't Patch
- Place router behind firewall with strict inbound rules blocking all unnecessary ports
- Change default admin credentials and use strong authentication
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface: System Status > Firmware Version. If version is V16.03.34.06, device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep firmwareVerVerify Fix Applied:
After firmware update, verify version is higher than V16.03.34.06 in System Status > Firmware Version.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by parental control API calls
- Unusual POST requests to /goform/getParentControlList
Network Indicators:
- Unusual traffic patterns to router web interface port 80/443
- Large payloads sent to parental control endpoints
SIEM Query:
source="router.log" AND (uri="/goform/getParentControlList" OR uri="/goform/getParentControlListInfo") AND status=200