CVE-2021-45569
📋 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 system compromise allowing attacker to install persistent backdoors, steal credentials, pivot to internal networks, or use device as part of botnet.
Likely Case
Attacker with valid credentials gains shell access to execute commands, potentially modifying device configuration, intercepting traffic, or disabling security features.
If Mitigated
With proper access controls and network segmentation, impact limited to isolated device compromise without lateral movement.
🎯 Exploit Status
Exploitation requires valid credentials; command injection typically straightforward once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.2.16.6 or later
Vendor Advisory: https://kb.netgear.com/000064091/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-WiFi-Systems-PSV-2020-0077
Restart Required: Yes
Instructions:
1. Log into NETGEAR router admin interface. 2. Navigate to Advanced > Administration > Firmware Update. 3. Check for updates and install firmware version 3.2.16.6 or later. 4. Reboot device after update completes.
🔧 Temporary Workarounds
Change default credentials
allChange default admin passwords to strong, unique credentials to reduce attack surface.
Restrict admin access
allLimit admin interface access to trusted IP addresses only using firewall rules.
🧯 If You Can't Patch
- Isolate affected devices on separate VLAN with strict firewall rules
- Implement network monitoring for suspicious command execution patterns
🔍 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 later in admin interface📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns suggesting command-and-control communication
SIEM Query:
source="netgear-router" AND (event_type="command_execution" OR event_type="shell_access")