CVE-2025-57572
📋 TL;DR
This CVE describes a buffer overflow vulnerability in Tenda F3 routers via the onlineList parameter in the setParentControl form handler. Attackers could potentially execute arbitrary code or crash the device by sending specially crafted requests. Users of Tenda F3 routers with affected firmware versions are vulnerable.
💻 Affected Systems
- Tenda F3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistence, and lateral movement within the network.
Likely Case
Router crash requiring physical reset, temporary denial of service, or limited memory corruption.
If Mitigated
No impact if the vulnerable endpoint is not accessible or proper input validation is implemented.
🎯 Exploit Status
Exploitation requires sending crafted HTTP POST requests to the vulnerable endpoint. Authentication status is unclear from the description.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Tenda for firmware updates after V12.01.01.48_multi
Vendor Advisory: http://tenda.com
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 the firmware. 5. Reboot the router.
🔧 Temporary Workarounds
Disable Parental Control Feature
allDisable the parental control functionality that uses the vulnerable endpoint
Restrict Web Interface Access
allConfigure firewall rules to restrict access to router web management interface
🧯 If You Can't Patch
- Isolate the router on a separate network segment
- Implement network monitoring for unusual HTTP POST requests to /goform/setParentControl
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface. If version is V12.01.01.48_multi or later, the device is vulnerable.Check Version:
Check via web interface at http://router_ip or use command: curl http://router_ip/login/AuthVerify Fix Applied:
After updating firmware, verify the version is newer than V12.01.01.48_multi and test the endpoint with malformed input.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/setParentControl
- Router crash/reboot logs
- Large payloads in HTTP requests
Network Indicators:
- HTTP POST requests with oversized onlineList parameter
- Traffic to router web interface from unexpected sources
SIEM Query:
source="router_logs" AND (uri="/goform/setParentControl" OR message="buffer overflow" OR message="crash")