CVE-2021-45624
📋 TL;DR
This vulnerability allows unauthenticated attackers to execute arbitrary commands on affected NETGEAR routers via command injection. It affects multiple NETGEAR router models running vulnerable firmware versions, potentially giving attackers full control over the device.
💻 Affected Systems
- NETGEAR D7000v2
- D8500
- R7000
- R7100LG
- R7900
- R8000
- XR300
- R7000P
- R8500
- R6900P
- R8300
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of router with ability to intercept/modify all network traffic, install persistent malware, pivot to internal network devices, and use router as attack platform.
Likely Case
Router takeover leading to DNS hijacking, credential theft from network traffic, and installation of backdoors for persistent access.
If Mitigated
Limited impact if router is behind firewall with restricted WAN access and regular monitoring detects anomalous activity.
🎯 Exploit Status
Exploitation requires no authentication and has been weaponized in real attacks. Public exploit code exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Varies by model - see specific fixed versions in CVE description
Vendor Advisory: https://kb.netgear.com/000064485/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-Routers-PSV-2020-0298
Restart Required: Yes
Instructions:
1. Log into router admin interface. 2. Navigate to Advanced > Administration > Firmware Update. 3. Check for updates. 4. If update available, download and install. 5. Router will reboot automatically.
🔧 Temporary Workarounds
Disable Remote Management
allPrevents WAN access to router management interface
Restrict Management Interface Access
allLimit management interface to specific trusted IP addresses
🧯 If You Can't Patch
- Isolate router in separate network segment with strict firewall rules
- Implement network monitoring for suspicious router traffic and command execution attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version against vulnerable ranges in CVE description via admin interfaceCheck Version:
Log into router admin interface and check firmware version in Advanced > Administration > Router StatusVerify Fix Applied:
Verify firmware version matches or exceeds fixed versions listed in vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in router logs
- Multiple failed login attempts followed by successful access
- Unexpected firmware or configuration changes
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Unexpected port scans originating from router
SIEM Query:
source="router_logs" AND (command="*;*" OR command="*|*" OR command="*`*" OR command="*$(*")