CVE-2021-45585
📋 TL;DR
This vulnerability allows authenticated attackers to execute arbitrary commands on affected NETGEAR WiFi systems. It affects RBK752, RBR750, RBS750, RBK852, RBR850, and RBS850 devices running firmware versions before 3.2.16.6. Attackers must have valid credentials to exploit this command injection flaw.
💻 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 allowing attackers to install persistent backdoors, intercept network traffic, pivot to other internal systems, or use the device as part of a botnet.
Likely Case
Unauthorized configuration changes, network disruption, credential theft, or installation of cryptocurrency miners on vulnerable devices.
If Mitigated
Limited impact if strong authentication controls prevent unauthorized access and network segmentation isolates the devices.
🎯 Exploit Status
Requires authenticated access but command injection vulnerabilities are typically easy to exploit once credentials are obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.2.16.6 or later
Vendor Advisory: https://kb.netgear.com/000064107/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-WiFi-Systems-PSV-2020-0093
Restart Required: Yes
Instructions:
1. Log into NETGEAR router 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 the device after installation completes.
🔧 Temporary Workarounds
Restrict administrative access
allLimit administrative interface access to trusted IP addresses only
Use strong authentication
allImplement complex passwords and consider multi-factor authentication if supported
🧯 If You Can't Patch
- Segment affected devices on isolated network VLANs
- Implement strict firewall rules limiting outbound connections from affected devices
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under Advanced > Administration > Firmware UpdateCheck Version:
Not applicable - check via web interfaceVerify Fix Applied:
Confirm firmware version shows 3.2.16.6 or higher after update📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in system logs
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Unexpected outbound connections from router
- Unusual traffic patterns to/from administrative interface
SIEM Query:
source="netgear-router" AND (event_type="command_execution" OR auth_success="true" AND suspicious_pattern=*)