CVE-2026-3169
📋 TL;DR
A buffer overflow vulnerability in Tenda F453 routers allows remote attackers to execute arbitrary code by manipulating the 'page' parameter in the SafeEmailFilter function. This affects Tenda F453 router users running firmware version 1.0.0.3. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- Tenda F453
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, and potential lateral movement to connected systems.
Likely Case
Router takeover allowing traffic interception, DNS manipulation, credential theft, and deployment of persistent malware.
If Mitigated
Limited impact if device is behind firewall with strict inbound rules and network segmentation prevents lateral movement.
🎯 Exploit Status
Exploit code is publicly available on GitHub. The buffer overflow manipulation is straightforward once the vulnerability is understood.
🛠️ 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 router with different model
- 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 InformationVerify Fix Applied:
Verify firmware version has changed from 1.0.0.3 to a newer version after update.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /goform/SafeEmailFilter with manipulated page parameter
- Router crash/restart logs
- Unusual outbound connections from router
Network Indicators:
- HTTP traffic to router management interface with abnormal parameter lengths
- Unexpected router reboots
- Suspicious traffic patterns originating from router
SIEM Query:
source="router_logs" AND (uri="/goform/SafeEmailFilter" AND param_length>normal) OR (event="crash" AND device="router")