CVE-2020-14111
📋 TL;DR
This CVE describes a command injection vulnerability in Xiaomi Router AX3600 firmware that allows attackers to execute arbitrary code on affected devices. The vulnerability stems from insufficient input validation of incoming data. All users of vulnerable Xiaomi Router AX3600 devices are affected.
💻 Affected Systems
- Xiaomi Router AX3600
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to intercept all network traffic, install persistent malware, pivot to internal networks, and use the device for botnet activities.
Likely Case
Attackers gain shell access to the router, modify DNS settings, intercept credentials, and potentially compromise connected devices.
If Mitigated
With proper network segmentation and firewall rules, impact is limited to the router itself without lateral movement to other systems.
🎯 Exploit Status
Command injection vulnerabilities typically have low exploitation complexity. Public advisories suggest exploitation is straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Xiaomi security advisory for specific patched firmware version
Vendor Advisory: https://trust.mi.com/zh-CN/misrc/bulletins/advisory?cveId=18
Restart Required: Yes
Instructions:
1. Log into router admin interface. 2. Check for firmware updates. 3. Apply latest firmware update from Xiaomi. 4. Reboot router after update completes.
🔧 Temporary Workarounds
Network Isolation
allPlace router in isolated network segment with strict firewall rules limiting inbound access
Disable Remote Management
allTurn off remote administration features if not required
🧯 If You Can't Patch
- Replace vulnerable router with patched or alternative device
- Implement strict network monitoring and intrusion detection for router traffic
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface and compare against patched version in Xiaomi advisoryCheck Version:
Check via router web interface or SSH if available: cat /etc/mi_release or similar version fileVerify Fix Applied:
Confirm firmware version matches or exceeds patched version listed in Xiaomi security advisory📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in router logs
- Unexpected process creation
- Suspicious network configuration changes
Network Indicators:
- Unusual outbound connections from router
- DNS hijacking patterns
- Unexpected port scanning from router
SIEM Query:
Example: source="router_logs" AND (command="*;*" OR command="*|*" OR command="*`*" OR command="*$(*")