CVE-2025-29031
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda AC6 routers via a buffer overflow in the fromAddressNat function. Attackers can gain full control of affected devices without authentication. All users running the vulnerable firmware version are affected.
💻 Affected Systems
- Tenda AC6
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover leading to persistent backdoor installation, network traffic interception, credential theft, 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 network segmentation isolates the router and external access is disabled.
🎯 Exploit Status
The GitHub reference contains technical details that could facilitate exploit development. Buffer overflow vulnerabilities in network devices are commonly weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. Download the latest firmware for AC6. 3. Log into router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevents external attackers from accessing the vulnerable interface
Network Segmentation
allIsolate the router from critical internal networks
🧯 If You Can't Patch
- Replace the router with a different model or vendor
- Implement strict firewall rules to block all inbound traffic to the router except essential management ports from trusted IPs
🔍 How to Verify
Check if Vulnerable:
Log into router admin interface and check firmware version under System Status or System Tools.Check Version:
No CLI command available. Must check via web interface at http://router_ip or via router admin panel.Verify Fix Applied:
Verify firmware version has been updated to a version newer than v15.03.05.16.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to router management interface
- Multiple failed login attempts followed by buffer overflow patterns
- Unexpected firmware modification logs
Network Indicators:
- Unusual outbound connections from router to unknown IPs
- Traffic patterns suggesting router compromise (C2 communications)
- Port scanning originating from router
SIEM Query:
source="router_logs" AND ("fromAddressNat" OR "buffer overflow" OR "segmentation fault")