CVE-2025-4150
📋 TL;DR
A critical buffer overflow vulnerability in Netgear EX6200 routers allows remote attackers to execute arbitrary code by manipulating the 'host' argument in the sub_54340 function. This affects users running firmware version 1.0.3.94. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- Netgear EX6200
📦 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 enabling traffic interception, DNS manipulation, credential theft, and deployment of persistent malware.
If Mitigated
Limited impact if device is behind strict network segmentation with no internet exposure.
🎯 Exploit Status
Public exploit details available in GitHub repository. Remote exploitation without authentication makes weaponization likely.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.netgear.com/
Restart Required: Yes
Instructions:
1. Check Netgear support site for firmware updates. 2. If update available, download and install via web interface. 3. Reboot router after installation.
🔧 Temporary Workarounds
Network Segmentation
allIsolate EX6200 from internet and critical internal networks
Access Control Lists
allImplement firewall rules to restrict access to router management interface
🧯 If You Can't Patch
- Replace vulnerable device with supported model
- Deploy behind dedicated firewall with strict ingress/egress filtering
🔍 How to Verify
Check if Vulnerable:
Access router web interface, navigate to Advanced > Administration > Router Status, check Firmware VersionCheck Version:
curl -s http://router-ip/currentsetting.htm | grep FirmwareVerify Fix Applied:
Verify firmware version is no longer 1.0.3.94 after update📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to management interface
- Multiple failed buffer overflow attempts in system logs
Network Indicators:
- Anomalous traffic patterns from router
- Unexpected outbound connections from router
SIEM Query:
source="router_logs" AND ("sub_54340" OR "buffer overflow" OR "host parameter manipulation")