CVE-2021-45642
📋 TL;DR
This CVE affects multiple NETGEAR routers, extenders, and WiFi systems due to incorrect security configuration settings. The vulnerability could allow attackers to bypass security controls or gain unauthorized access to network devices. Users with affected NETGEAR devices running vulnerable firmware versions are at risk.
💻 Affected Systems
- NETGEAR D7800
- EX6250
- EX7700
- LBR20
- RBS50Y
- R8900
- R9000
- XR450
- XR500
- XR700
- EX7320
- RAX120
- EX7300v2
- RAX120v2
- EX6410
- RBR10
- RBR20
- RBR40
- RBR50
- EX6420
- RBS10
- RBS20
- RBS40
- RBS50
- EX6400v2
- RBK12
- RBK20
- RBK40
- RBK50
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of network device allowing attacker to intercept traffic, modify configurations, or use device as pivot point into internal network
Likely Case
Unauthorized access to device management interface leading to configuration changes or network disruption
If Mitigated
Minimal impact if device is behind firewall with restricted management access and proper network segmentation
🎯 Exploit Status
Security misconfiguration vulnerabilities typically have low exploitation complexity, especially when affecting default configurations
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: See NETGEAR advisory for specific fixed versions per device model
Vendor Advisory: https://kb.netgear.com/000064491/Security-Advisory-for-Security-Misconfiguration-on-Some-Routers-Extenders-and-WiFi-Systems-PSV-2020-0427
Restart Required: Yes
Instructions:
1. Identify your NETGEAR device model. 2. Check current firmware version in web interface. 3. Visit NETGEAR support site for your model. 4. Download latest firmware version. 5. Upload via web interface. 6. Wait for automatic reboot.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to device management interface
Restrict management access
allLimit management interface access to specific trusted IP addresses only
🧯 If You Can't Patch
- Isolate affected devices in separate VLAN with strict firewall rules
- Implement network monitoring for suspicious access attempts to device management interfaces
🔍 How to Verify
Check if Vulnerable:
1. Access NETGEAR web interface. 2. Navigate to Advanced > Administration > Firmware Update. 3. Compare current version with vulnerable versions listed in advisory.Check Version:
No CLI command - check via web interface at Advanced > Administration > Firmware UpdateVerify Fix Applied:
Confirm firmware version matches or exceeds fixed versions specified in NETGEAR advisory for your device model📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to router management interface
- Unexpected configuration changes
- Multiple failed login attempts
Network Indicators:
- Unusual traffic patterns from router to external IPs
- Management interface access from unexpected sources
SIEM Query:
source="router_logs" AND (event="login_failed" OR event="configuration_change")