CVE-2026-3376
📋 TL;DR
A buffer overflow vulnerability in Tenda F453 routers allows remote attackers to execute arbitrary code by manipulating the 'page' parameter in the SafeMacFilter function. This affects Tenda F453 router version 1.0.0.3. Attackers can exploit this without authentication to potentially take control of affected devices.
💻 Affected Systems
- Tenda F453
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement to internal networks, and persistent backdoor installation.
Likely Case
Router compromise allowing traffic interception, DNS hijacking, or botnet recruitment.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public exploit code exists in GitHub repositories, making exploitation straightforward for attackers.
🛠️ 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. Access 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 to separate VLAN
🧯 If You Can't Patch
- Replace vulnerable devices with patched or different models
- Implement strict firewall rules blocking all inbound traffic to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 1.0.0.3, device is vulnerable.Check Version:
Check via router web interface at 192.168.0.1 or 192.168.1.1 under System Status or Firmware sectionVerify Fix Applied:
Verify firmware version has changed from 1.0.0.3 to a newer version after update.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SafeMacFilter
- Multiple failed buffer overflow attempts in logs
Network Indicators:
- Unusual traffic patterns to router management interface
- Suspicious payloads in HTTP requests
SIEM Query:
source_ip="*" AND dest_ip="router_ip" AND url_path="/goform/SafeMacFilter" AND http_method="POST"