CVE-2020-35777
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on NETGEAR DGN2200v1 routers by injecting malicious commands into vulnerable parameters. It affects all users of NETGEAR DGN2200v1 routers running firmware versions before v1.0.0.58. Successful exploitation could give attackers full control of the affected router.
💻 Affected Systems
- NETGEAR DGN2200v1
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to intercept all network traffic, install persistent backdoors, pivot to internal networks, and use the device for botnet activities.
Likely Case
Attackers gain shell access to the router, modify network settings, intercept credentials, and potentially compromise connected devices.
If Mitigated
Limited impact with proper network segmentation, but still exposes the router to unauthorized configuration changes.
🎯 Exploit Status
The vulnerability is in the web interface and can be exploited via HTTP requests. No authentication required for exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.0.0.58 or later
Vendor Advisory: https://kb.netgear.com/000062634/Security-Advisory-for-Command-Injection-Vulnerability-on-DGN2200v1-PSV-2020-0411
Restart Required: Yes
Instructions:
1. Log into router web interface. 2. Navigate to Advanced > Administration > Router Update. 3. Click 'Check' for updates. 4. If v1.0.0.58 or later is available, click 'Yes' to update. 5. Wait for router to reboot automatically.
🔧 Temporary Workarounds
Disable remote management
allPrevents external attackers from accessing the vulnerable web interface
Log into router > Advanced > Remote Management > Uncheck 'Turn Remote Management On'
Restrict web interface access
allLimit access to router web interface to trusted IP addresses only
Log into router > Advanced > Security > Access Control > Add trusted IP addresses
🧯 If You Can't Patch
- Replace the router with a supported model that receives security updates
- Place the router behind a firewall that blocks all inbound access to its management interface
🔍 How to Verify
Check if Vulnerable:
Log into router web interface and check firmware version. If version is below v1.0.0.58, the device is vulnerable.Check Version:
curl -s http://routerlogin.net/currentsetting.htm | grep FirmwareVerify Fix Applied:
After updating, verify firmware version shows v1.0.0.58 or higher in the router web interface.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in router logs
- Multiple failed login attempts followed by successful access
- Unexpected configuration changes
Network Indicators:
- Unusual outbound connections from router
- Traffic to known malicious IPs from router
- DNS hijacking or unexpected proxy settings
SIEM Query:
source="router_logs" AND ("command injection" OR "shell" OR "exec" OR suspicious POST requests to router management interface)