CVE-2021-45577
📋 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.
💻 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 system compromise allowing attacker to install persistent backdoors, steal credentials, pivot to internal networks, or disrupt network services.
Likely Case
Privilege escalation leading to unauthorized access to device configuration, network traffic interception, or denial of service.
If Mitigated
Limited impact if strong authentication controls and network segmentation prevent unauthorized access to management interfaces.
🎯 Exploit Status
Exploitation requires authenticated access to the device's management interface. The vulnerability is in post-authentication functionality.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.2.16.6 or later
Vendor Advisory: https://kb.netgear.com/000064099/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-WiFi-Systems-PSV-2020-0085
Restart Required: Yes
Instructions:
1. Log into the router's web interface. 2. Navigate to Advanced > Administration > Firmware Update. 3. Check for updates and install firmware version 3.2.16.6 or later. 4. The device will reboot automatically after installation.
🔧 Temporary Workarounds
Restrict Management Access
allLimit access to router management interfaces to trusted IP addresses only
Use Strong Authentication
allImplement complex passwords and consider multi-factor authentication if supported
🧯 If You Can't Patch
- Isolate affected devices in a separate VLAN with strict network segmentation
- Implement strict access controls and monitor for suspicious authentication attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under Advanced > Administration > Firmware UpdateCheck Version:
No CLI command available. Check via web interface at Advanced > Administration > Firmware UpdateVerify Fix Applied:
Verify firmware version shows 3.2.16.6 or later after update📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in system logs
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Unusual outbound connections from router management IP
- Traffic patterns suggesting command and control activity
SIEM Query:
source="router_logs" AND (event_type="command_execution" OR event_type="system_call")