CVE-2021-45563
📋 TL;DR
This vulnerability allows authenticated users to execute arbitrary commands on affected NETGEAR WiFi systems through command injection. It affects specific NETGEAR Orbi mesh WiFi systems running vulnerable firmware versions. Attackers with valid credentials can potentially gain full control of the device.
💻 Affected Systems
- NETGEAR RBK752
- NETGEAR RBR750
- NETGEAR RBS750
- NETGEAR RBK852
- NETGEAR RBR850
- NETGEAR RBS850
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, and use as botnet node.
Likely Case
Authenticated attacker gains shell access to modify device configuration, install malware, or pivot to other network devices.
If Mitigated
With strong authentication controls and network segmentation, impact limited to isolated device compromise.
🎯 Exploit Status
Exploitation requires valid credentials but command injection is straightforward once authenticated. No public exploit code available but technique is well-known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.2.16.6 or later
Vendor Advisory: https://kb.netgear.com/000064084/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-WiFi-Systems-PSV-2020-0066
Restart Required: Yes
Instructions:
1. Log into NETGEAR Orbi web interface. 2. Navigate to Advanced > Administration > Firmware Update. 3. Check for updates and install firmware version 3.2.16.6 or later. 4. Reboot all devices in the mesh system.
🔧 Temporary Workarounds
Restrict administrative access
allLimit web interface access to trusted IP addresses only
Configure firewall rules to restrict access to router admin interface (default port 80/443)
Use strong authentication
allImplement complex passwords and consider multi-factor authentication if supported
Change default admin password to complex unique password
🧯 If You Can't Patch
- Segment affected devices on isolated VLAN to limit lateral movement
- Implement strict network monitoring for unusual outbound connections from routers
🔍 How to Verify
Check if Vulnerable:
Check firmware version in Orbi web interface under Advanced > Administration > Firmware UpdateCheck Version:
curl -k https://routerlogin.net/currentsetting.htm | grep FirmwareVerify Fix Applied:
Confirm firmware version is 3.2.16.6 or higher in the same location📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Unexpected outbound connections from router to external IPs
- Unusual DNS queries from router
SIEM Query:
source="router.log" AND ("command injection" OR "shell" OR "exec" OR suspicious command patterns)