CVE-2025-70648
📋 TL;DR
Tenda AX1803 routers running firmware v1.0.0.1 contain a stack overflow vulnerability in the security_5g parameter handling. Attackers can send crafted requests to trigger a Denial of Service (DoS), potentially crashing the device. This affects all users of this specific router model and firmware version.
💻 Affected Systems
- Tenda AX1803
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router crash requiring physical power cycle, disrupting all network connectivity for connected devices.
Likely Case
Router becomes unresponsive, requiring reboot and temporary network outage.
If Mitigated
Limited impact if device is behind firewall with restricted access to management interface.
🎯 Exploit Status
Public GitHub repository contains technical details and proof-of-concept.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
Check Tenda website for firmware updates. If available, download and install through router web interface.
🔧 Temporary Workarounds
Restrict Management Interface Access
allLimit access to router management interface to trusted internal IPs only.
Disable Remote Management
allTurn off remote administration features if enabled.
🧯 If You Can't Patch
- Replace router with different model or vendor
- Place router behind firewall with strict inbound rules
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface. If version is exactly v1.0.0.1, device is vulnerable.Check Version:
Login to router web interface and check firmware version in System Status or similar section.Verify Fix Applied:
Verify firmware version has changed from v1.0.0.1 after update.📡 Detection & Monitoring
Log Indicators:
- Multiple malformed requests to router management interface
- Router reboot events without user action
Network Indicators:
- Unusual traffic patterns to router management port (typically 80/443)
- Router becoming unresponsive to legitimate requests
SIEM Query:
source_ip=* dest_ip=[ROUTER_IP] dest_port=80|443 uri_path contains "security_5g"