CVE-2025-45427
📋 TL;DR
This CVE describes a stack overflow vulnerability in Tenda AC9 routers that allows remote attackers to execute arbitrary code. The vulnerability affects Tenda AC9 v1.0 devices running firmware V15.03.05.14_multi. Attackers can exploit this via the /goform/WifiBasicSet endpoint without authentication.
💻 Affected Systems
- Tenda AC9
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install persistent malware, pivot to internal networks, intercept all network traffic, and use device as botnet node.
Likely Case
Router takeover leading to DNS hijacking, credential theft, man-in-the-middle attacks, and network disruption.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and network segmentation.
🎯 Exploit Status
Public GitHub repository contains exploit details. No authentication required for exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None found
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates
2. Download latest firmware for AC9 v1.0
3. Log into router admin interface
4. Navigate to System Tools > Firmware Upgrade
5. Upload and install new firmware
6. Reboot router
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router web interface
Network Segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Replace affected router with different model/brand
- Place router behind firewall with strict inbound rules blocking all ports except essential services
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status. If version is V15.03.05.14_multi on AC9 v1.0 hardware, device is vulnerable.Check Version:
curl -s http://router-ip/goform/GetSysInfo | grep firmwareVerify Fix Applied:
Verify firmware version has changed from V15.03.05.14_multi to newer version after update.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/WifiBasicSet with large payloads
- Unusual process execution in router logs
- Failed authentication attempts followed by successful WifiBasicSet access
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Traffic redirection patterns
SIEM Query:
source="router_logs" AND (uri="/goform/WifiBasicSet" AND bytes>1000) OR (process="malicious_binary" AND host="router")