CVE-2020-14094
📋 TL;DR
This vulnerability in Xiaomi R3600 routers allows attackers to inject malicious code through the web interface, leading to stack overflow and potential remote code execution. It affects users with ROM versions below 1.0.20. Attackers could gain full control of affected routers.
💻 Affected Systems
- Xiaomi Router R3600
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing attacker to intercept all network traffic, install persistent malware, pivot to internal networks, and use router as botnet node.
Likely Case
Router takeover enabling traffic monitoring, DNS hijacking, credential theft, and lateral movement to connected devices.
If Mitigated
Limited impact if router is isolated from critical networks and has strict firewall rules, though still vulnerable to local network attacks.
🎯 Exploit Status
Exploitation requires web interface access but no authentication. CVSS 9.8 indicates trivial exploitation with high impact.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: ROM version 1.0.20 or later
Vendor Advisory: https://privacy.mi.com/trust#/security/vulnerability-management/vulnerability-announcement/detail?id=17
Restart Required: Yes
Instructions:
1. Log into router admin interface. 2. Navigate to System Update. 3. Check for updates. 4. Install ROM version 1.0.20 or later. 5. Reboot router after update completes.
🔧 Temporary Workarounds
Disable Web Interface Access
linuxBlock external access to router web interface
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Network Segmentation
allIsolate router on separate VLAN from critical systems
🧯 If You Can't Patch
- Disable remote administration and restrict web interface to local network only
- Implement strict firewall rules to limit router communication to only necessary services
🔍 How to Verify
Check if Vulnerable:
Check router admin interface for ROM version. If version is below 1.0.20, system is vulnerable.Check Version:
Login to router web interface and check System Status or About page for ROM versionVerify Fix Applied:
Confirm ROM version is 1.0.20 or higher in router admin interface.📡 Detection & Monitoring
Log Indicators:
- Unusual web interface access patterns
- Multiple failed injection attempts
- Unexpected process execution
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Traffic redirection patterns
SIEM Query:
source="router_logs" AND (message="*injection*" OR message="*overflow*" OR message="*unauthorized*access*")