CVE-2025-25456
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda AC10 routers via a buffer overflow in the AdvSetMacMtuWan function. Attackers can exploit this by sending specially crafted requests to the vulnerable parameter 'mac2'. All users running the affected firmware version are at risk.
💻 Affected Systems
- Tenda AC10
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to remote code execution, router takeover, network traffic interception, and lateral movement to other devices.
Likely Case
Router compromise allowing attackers to modify settings, intercept traffic, or use the device as a foothold for further attacks.
If Mitigated
Limited impact if network segmentation prevents router access or if exploit attempts are blocked by security controls.
🎯 Exploit Status
Public proof-of-concept code exists, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No vendor advisory found at time of analysis
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware for AC10. 3. Log into router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router administration interface
Network segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Replace affected router with different model/brand
- Implement strict firewall rules blocking all external access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is V4.0si_V16.03.10.20, device is vulnerable.Check Version:
Login to router web interface and check System Status or Firmware Version pageVerify Fix Applied:
After updating firmware, verify version is no longer V4.0si_V16.03.10.20.📡 Detection & Monitoring
Log Indicators:
- Multiple failed requests to AdvSetMacMtuWan endpoint
- Unusual POST requests with long mac2 parameters
Network Indicators:
- Traffic to router management interface with unusually long parameter values
- Exploit pattern matching known PoC signatures
SIEM Query:
source="router_logs" AND (uri="*AdvSetMacMtuWan*" AND parameter_length>100)