CVE-2021-45513
📋 TL;DR
This vulnerability allows unauthenticated attackers to execute arbitrary commands on NETGEAR XR1000 routers. Attackers can gain full control of affected devices by injecting malicious commands through network requests. All users with XR1000 routers running vulnerable firmware are affected.
💻 Affected Systems
- NETGEAR XR1000
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent malware, intercept all network traffic, pivot to internal networks, or use the device as part of a botnet.
Likely Case
Attackers gain remote shell access to modify router settings, steal credentials, or deploy cryptocurrency miners.
If Mitigated
If properly patched, no impact. With network segmentation, impact limited to router itself.
🎯 Exploit Status
Exploit requires sending specially crafted HTTP requests to vulnerable endpoints. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.0.58 or later
Vendor Advisory: https://kb.netgear.com/000064149/Security-Advisory-for-Command-Injection-on-XR1000-PSV-2021-0010
Restart Required: Yes
Instructions:
1. Log into router admin interface. 2. Navigate to Advanced > Administration > Firmware Update. 3. Check for updates and install version 1.0.0.58 or later. 4. Reboot router after update completes.
🔧 Temporary Workarounds
Network Segmentation
allIsolate router management interface from untrusted networks
Access Control Lists
allRestrict access to router management interface to trusted IPs only
🧯 If You Can't Patch
- Disable remote management and WAN-side administration
- Place router behind firewall with strict inbound rules
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under Advanced > Administration > Firmware UpdateCheck Version:
curl -s http://router_ip/currentsetting.htm | grep firmware_versionVerify Fix Applied:
Confirm firmware version is 1.0.0.58 or later in admin interface📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed login attempts followed by successful command execution
- Suspicious HTTP requests to router management endpoints
Network Indicators:
- Unusual outbound connections from router
- HTTP requests with command injection patterns to router IP
- Traffic to known malicious IPs from router
SIEM Query:
source="router_logs" AND ("cmd=" OR "exec=" OR "system(") AND dest_ip="router_ip"