CVE-2017-18864
📋 TL;DR
This vulnerability allows unauthenticated remote attackers to execute arbitrary code on affected NETGEAR routers via a buffer overflow. Attackers can exploit this without credentials to potentially take full control of the device. Users with specific NETGEAR router models running outdated firmware are affected.
💻 Affected Systems
- NETGEAR R6400
- NETGEAR R6400v2
- NETGEAR R6700
- NETGEAR R6900
- NETGEAR R7000
- NETGEAR R7000P
- NETGEAR R6900P
- NETGEAR R7100LG
- NETGEAR R7300
- NETGEAR R7900
- NETGEAR R8300
- NETGEAR R8500
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of router with persistent backdoor installation, credential theft, network traffic interception, and lateral movement to internal devices.
Likely Case
Router compromise leading to DNS hijacking, credential harvesting, or botnet recruitment for DDoS attacks.
If Mitigated
Limited impact with proper network segmentation and firewall rules blocking external router management access.
🎯 Exploit Status
Exploit code is publicly available and has been used in real-world attacks. The vulnerability is easily exploitable with available tools.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: See affected_systems.versions for minimum fixed versions
Vendor Advisory: https://kb.netgear.com/000051495/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Routers-PSV-2017-0791
Restart Required: Yes
Instructions:
1. Log into router admin interface. 2. Navigate to Advanced > Administration > Firmware Update. 3. Check for updates and install latest firmware. 4. Reboot router after update completes.
🔧 Temporary Workarounds
Disable Remote Management
allPrevents external exploitation by disabling router management from WAN interface
Network Segmentation
allPlace router on isolated management VLAN with strict firewall rules
🧯 If You Can't Patch
- Replace affected router with supported 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 under Advanced > Administration > Firmware UpdateCheck Version:
No CLI command - check via web interface at http://routerlogin.net or http://192.168.1.1Verify Fix Applied:
Verify firmware version matches or exceeds minimum fixed version listed in affected_systems.versions📡 Detection & Monitoring
Log Indicators:
- Unusual buffer overflow errors in router logs
- Multiple failed exploit attempts
- Unexpected firmware or configuration changes
Network Indicators:
- Unusual outbound connections from router
- DNS hijacking patterns
- Traffic redirection to suspicious IPs
SIEM Query:
source="router" AND (event_type="buffer_overflow" OR event_type="exploit_attempt")