CVE-2021-29067
📋 TL;DR
This vulnerability allows attackers to bypass authentication on affected NETGEAR WiFi systems, potentially gaining unauthorized access to network settings and connected devices. It affects multiple NETGEAR Orbi WiFi 6 and WiFi 5 mesh systems running outdated firmware versions.
💻 Affected Systems
- NETGEAR RBW30
- RBS40V
- RBK852
- RBK853
- RBK854
- RBR850
- RBS850
- RBK752
- RBK753
- RBK753S
- RBK754
- RBR750
- RBS750
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete network compromise allowing attackers to reconfigure network settings, intercept traffic, install malware on connected devices, and use the network as a pivot point for further attacks.
Likely Case
Unauthorized access to router administration interface leading to network configuration changes, DNS hijacking, or credential theft from connected devices.
If Mitigated
Limited impact if network segmentation is implemented and the device is not internet-facing, though local network access could still be compromised.
🎯 Exploit Status
Authentication bypass vulnerabilities are typically easy to exploit. Public advisories and CVSS 9.6 score suggest weaponization is likely.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: RBW30: 2.6.2.2, RBS40V: 2.6.2.4, all other models: 3.2.17.12 or later
Vendor Advisory: https://kb.netgear.com/000063017/Security-Advisory-for-Authentication-Bypass-on-Some-WiFi-Systems-PSV-2020-0492
Restart Required: Yes
Instructions:
1. Log into router admin interface. 2. Navigate to Advanced > Administration > Firmware Update. 3. Check for updates and apply the latest firmware. 4. Reboot the device after update completes.
🔧 Temporary Workarounds
Disable Remote Management
allPrevents external exploitation by disabling remote access to the admin interface
Network Segmentation
allIsolate the router management interface to a separate VLAN with restricted access
🧯 If You Can't Patch
- Disable WAN access to admin interface and restrict LAN access to trusted IPs only
- Implement network monitoring for unauthorized access attempts to router admin pages
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under Advanced > Administration > Firmware UpdateCheck Version:
No CLI command - check via web interface at http://[router-ip]Verify Fix Applied:
Confirm firmware version matches or exceeds patched versions listed in vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unauthorized access to admin pages
- Multiple failed login attempts followed by successful access
- Configuration changes from unexpected IP addresses
Network Indicators:
- HTTP requests to router admin pages from external IPs
- Unusual traffic patterns to/from router management interface
SIEM Query:
source_ip=external AND (url_path CONTAINS "/cgi-bin/" OR url_path CONTAINS "/admin/") AND dest_ip=router_ip