CVE-2026-3377
📋 TL;DR
A buffer overflow vulnerability in Tenda F453 routers allows remote attackers to execute arbitrary code by manipulating the 'page' parameter in the fromSafeUrlFilter function. This affects Tenda F453 routers 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
Remote code execution allowing attackers to install malware, create backdoors, intercept network traffic, or use the device as part of a botnet.
If Mitigated
Limited impact if device is behind strict network segmentation and firewalls, though device compromise still possible.
🎯 Exploit Status
Public exploit details available on GitHub; remote exploitation without authentication makes weaponization likely.
🛠️ 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 for F453
3. Access router admin interface
4. Upload and apply firmware update
5. Reboot router
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected routers from critical network segments
Access Control
linuxRestrict access to router admin interface to trusted IPs only
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Replace affected routers with different models or brands
- Implement strict network monitoring and intrusion detection for router traffic
🔍 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 http://router_ip or using telnet/ssh if enabledVerify Fix Applied:
Verify firmware version has been updated to a version later than 1.0.0.3.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SafeUrlFilter
- Buffer overflow error messages in router logs
- Unexpected reboots or crashes
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns suggesting command and control communication
- Port scanning originating from router
SIEM Query:
source="router_logs" AND (uri="/goform/SafeUrlFilter" OR message="buffer overflow" OR message="segmentation fault")