CVE-2021-45565
📋 TL;DR
This vulnerability allows authenticated users 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 with valid credentials can inject malicious commands through vulnerable interfaces.
💻 Affected Systems
- NETGEAR RBK752
- NETGEAR RBR750
- NETGEAR RBS750
- NETGEAR RBK852
- NETGEAR RBR850
- NETGEAR RBS850
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to network infiltration, data exfiltration, and use as pivot point for lateral movement within the network.
Likely Case
Unauthorized configuration changes, network disruption, credential harvesting, and installation of persistent backdoors.
If Mitigated
Limited to authenticated users only, reducing attack surface to those with valid credentials.
🎯 Exploit Status
Requires authenticated access. Command injection vulnerabilities typically have straightforward exploitation paths once authentication is bypassed or obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.2.16.6 or later
Vendor Advisory: https://kb.netgear.com/000064086/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-WiFi-Systems-PSV-2020-0069
Restart Required: Yes
Instructions:
1. Log into NETGEAR router admin interface. 2. Navigate to Advanced > Administration > Firmware Update. 3. Check for updates and install version 3.2.16.6 or later. 4. Reboot device after update completes.
🔧 Temporary Workarounds
Restrict Admin Access
allLimit administrative access to trusted IP addresses only
Strong Authentication
allEnforce complex passwords and consider multi-factor authentication if supported
🧯 If You Can't Patch
- Isolate affected devices in separate VLAN with strict firewall rules
- Implement network segmentation to limit lateral movement potential
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin 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 from router management interface
SIEM Query:
source="router_logs" AND (command="*;*" OR command="*|*" OR command="*`*" OR command="*$(*")