CVE-2025-70645 – This CVE describes a stack overflow vulnerabili... (How to Fix)

📋 TL;DR

This CVE describes a stack overflow vulnerability in Tenda AX-1806 routers that allows attackers to cause Denial of Service (DoS) by sending specially crafted requests to the deviceList parameter. The vulnerability affects Tenda AX-1806 routers running firmware version 1.0.0.1. Attackers can exploit this remotely to crash the router's web interface or potentially execute arbitrary code.

💻 Affected Systems

Products:

Tenda AX-1806

Versions: v1.0.0.1

Operating Systems: Embedded Linux (router firmware)

Default Config Vulnerable: ⚠️ Yes

Notes: Affects the web management interface of the router. The vulnerability is in the formSetWifiMacFilterCfg function.

📦 What is this software?

Ax1806 Firmware by Tenda

View all CVEs affecting Ax1806 Firmware →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to complete device compromise, persistent backdoor installation, and network infiltration

🟠

Likely Case

Denial of Service causing router reboot or web interface crash, disrupting network connectivity

🟢

If Mitigated

Limited impact with proper network segmentation and firewall rules blocking external access to router management interface

🌐 Internet-Facing: HIGH - Router management interfaces are often exposed to the internet by default

🏢 Internal Only: MEDIUM - Requires attacker to be on local network or have compromised internal access

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Proof of concept available in GitHub repository. Exploitation requires sending crafted HTTP POST request to vulnerable endpoint.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Unknown

Vendor Advisory: Not available

Restart Required: Yes

Instructions:

1. Check Tenda support website for firmware updates
2. Download latest firmware for AX-1806
3. Log into router web interface
4. Navigate to System Tools > Firmware Upgrade
5. Upload and install new firmware
6. Reboot router after installation

🔧 Temporary Workarounds

Disable Remote Management

all

Prevent external access to router management interface

Restrict Management Interface Access

all

Configure firewall to only allow management access from trusted IP addresses

🧯 If You Can't Patch

Segment router management interface to isolated VLAN
Implement network monitoring for suspicious HTTP requests to router management interface

🔍 How to Verify

Check if Vulnerable:

Check router firmware version in web interface under System Status or System Tools

Check Version:

curl -s http://router-ip/goform/getStatus | grep version

Verify Fix Applied:

Verify firmware version is updated beyond v1.0.0.1

📡 Detection & Monitoring

Log Indicators:

Unusual HTTP POST requests to /goform/setWifiMacFilterCfg
Router crash/reboot logs
Large deviceList parameter values in web logs

Network Indicators:

HTTP POST requests with oversized deviceList parameter to router management IP
Multiple connection attempts to router management interface

SIEM Query:

source="router_logs" AND (uri="/goform/setWifiMacFilterCfg" OR message="deviceList") AND bytes>1000

📊 Metadata

CVE ID: CVE-2025-70645

CVSS v3 Score: 7.5 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE: CWE-121

EPSS Score: 0.05% exploit probability (14.9th percentile)

Published: January 21, 2026

Last Updated: January 26, 2026

🔗 References

https://github.com/0-fool/VulnbyCola/blob/main/Tenda/AX-1806/2/1.md Exploit,Third Party Advisory

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🔗 Related Vulnerabilities

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