CVE-2024-51012
📋 TL;DR
This vulnerability in Netgear R8500 routers allows attackers to cause a Denial of Service (DoS) by sending a specially crafted POST request to the ipv6_fix.cgi endpoint. The stack overflow in the ipv6_pri_dns parameter can crash the router, disrupting network services. Only users running Netgear R8500 firmware version 1.0.2.160 are affected.
💻 Affected Systems
- Netgear R8500
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Router becomes completely unresponsive, requiring physical power cycle or factory reset to restore functionality, causing extended network downtime.
Likely Case
Router crashes and reboots automatically, causing temporary network disruption (1-3 minutes) until services are restored.
If Mitigated
With proper network segmentation and access controls, impact is limited to isolated network segments with minimal business disruption.
🎯 Exploit Status
Exploit requires network access to router's web interface but no authentication. Simple curl command can trigger the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Netgear support for latest firmware
Vendor Advisory: https://www.netgear.com/about/security/
Restart Required: Yes
Instructions:
1. Log into Netgear router admin interface. 2. Navigate to Advanced > Administration > Firmware Update. 3. Check for updates and apply latest firmware. 4. Reboot router after update completes.
🔧 Temporary Workarounds
Disable IPv6
allDisable IPv6 functionality to remove vulnerable code path
Login to router admin > Advanced > Advanced Setup > IPv6 > Disable IPv6
Restrict Web Interface Access
allLimit access to router admin interface to trusted networks only
Login to router admin > Advanced > Security > Access Control > Set allowed IP ranges
🧯 If You Can't Patch
- Segment router management interface to isolated VLAN with strict access controls
- Implement network monitoring for abnormal POST requests to ipv6_fix.cgi endpoint
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface: Advanced > Administration > Router Status > Firmware VersionCheck Version:
curl -s http://router-ip/currentsetting.htm | grep FirmwareVerify Fix Applied:
Verify firmware version is newer than v1.0.2.160 and test IPv6 functionality remains operational📡 Detection & Monitoring
Log Indicators:
- Router crash/reboot logs
- Multiple POST requests to /ipv6_fix.cgi
- Abnormal IPv6 configuration attempts
Network Indicators:
- HTTP POST to /ipv6_fix.cgi with large ipv6_pri_dns parameter
- Sudden loss of router connectivity
SIEM Query:
source="router.log" AND ("ipv6_fix.cgi" OR "POST /ipv6_fix.cgi")