CVE-2026-3732
📋 TL;DR
This is a remote stack-based buffer overflow vulnerability in Tenda F453 routers affecting the exeCommand function. Attackers can exploit this to execute arbitrary code on vulnerable devices, potentially gaining full control. All users of Tenda F453 routers with firmware version 1.0.0.3 are affected.
💻 Affected Systems
- Tenda F453
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, credential theft, network pivoting, and persistent backdoor installation.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as a foothold into internal networks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public exploit code is available, 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. 3. Upload via router admin interface. 4. Reboot router.
🔧 Temporary Workarounds
Network Segmentation
allIsolate vulnerable routers from critical networks and internet exposure
Firewall Rules
linuxBlock external access to router management interface (typically port 80/443)
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Replace vulnerable routers with patched or different models
- Implement strict network monitoring and anomaly detection for router traffic
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface (typically 192.168.0.1 or 192.168.1.1)Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is updated beyond 1.0.0.3📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/exeCommand
- Multiple failed authentication attempts
- Unexpected configuration changes
Network Indicators:
- Unusual outbound connections from router
- Traffic spikes to router management interface
- Suspicious payloads in HTTP requests
SIEM Query:
source="router_logs" AND (uri="/goform/exeCommand" OR cmdinput=*)