CVE-2025-29101
📋 TL;DR
A stack overflow vulnerability in Tenda AC8V4.0 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 users running firmware version V16.03.34.06 on Tenda AC8V4.0 routers. The vulnerability is exploitable via the deviceid parameter.
💻 Affected Systems
- Tenda AC8V4.0
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, and lateral movement to connected networks.
Likely Case
Denial of service causing router crashes and network disruption, potentially requiring physical reset.
If Mitigated
Limited impact if network segmentation isolates the router and input validation is enforced.
🎯 Exploit Status
Exploitation requires sending crafted requests to the vulnerable function, but authentication status is unclear from available information.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Later than V16.03.34.06 (check Tenda for specific fixed version)
Vendor Advisory: Not provided in references
Restart Required: Yes
Instructions:
1. Log into Tenda router admin interface. 2. Navigate to System Tools > Firmware Upgrade. 3. Download latest firmware from Tenda website. 4. Upload and install firmware update. 5. Reboot router after installation.
🔧 Temporary Workarounds
Disable Parental Control Feature
allDisable the parental control functionality that uses the vulnerable get_parentControl_list_Info function
Network Segmentation
allIsolate Tenda router from critical network segments and restrict access to management interface
🧯 If You Can't Patch
- Replace vulnerable router with updated model or different vendor
- Implement strict firewall rules to block all external access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under System Status or System ToolsCheck Version:
Login to router web interface and navigate to System Status pageVerify Fix Applied:
Confirm firmware version is newer than V16.03.34.06 and test parental control functionality📡 Detection & Monitoring
Log Indicators:
- Multiple failed requests to get_parentControl_list_Info endpoint
- Router crash/reboot logs
- Unusual traffic patterns to router management interface
Network Indicators:
- HTTP POST requests with oversized deviceid parameter to parental control endpoints
- Router becoming unresponsive
SIEM Query:
source="router_logs" AND (uri="/goform/get_parentControl_list_Info" OR message="stack overflow" OR message="deviceid")