CVE-2025-4299
📋 TL;DR
A critical buffer overflow vulnerability in Tenda AC1206 routers allows remote attackers to execute arbitrary code by exploiting the setSchedWifi function. This affects all Tenda AC1206 routers running firmware versions up to 15.03.06.23. Attackers can potentially take full control of vulnerable devices without authentication.
💻 Affected Systems
- Tenda AC1206
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, creation of persistent backdoors, network traffic interception, and lateral movement to other devices on the network.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as part of a botnet.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering, though internal network compromise remains possible.
🎯 Exploit Status
Public exploit details are available on GitHub, making exploitation straightforward for attackers with basic skills.
🛠️ 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 AC1206. 3. Log into router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and install new firmware. 6. Reboot router after installation.
🔧 Temporary Workarounds
Network Segmentation
allIsolate vulnerable routers in separate network segments to limit potential lateral movement.
Access Control Lists
allImplement firewall rules to restrict access to router management interface from untrusted networks.
🧯 If You Can't Patch
- Replace vulnerable routers with patched or different models
- Implement strict network monitoring and intrusion detection for exploit attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface. If version is 15.03.06.23 or earlier, device is vulnerable.Check Version:
Login to router web interface and check System Status or Firmware Version pageVerify Fix Applied:
Verify firmware version is higher than 15.03.06.23 after applying any available updates.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/openSchedWifi
- Large payloads in HTTP requests to router management interface
- Multiple failed exploit attempts
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns suggesting router compromise
- Exploit payloads in HTTP traffic
SIEM Query:
source="router_logs" AND (uri="/goform/openSchedWifi" OR method="POST" AND size>1000)