CVE-2021-21952
📋 TL;DR
An authentication bypass vulnerability in Anker Eufy Homebase 2 allows attackers to gain elevated privileges without valid credentials by sending specially crafted network packets. This affects all users of the vulnerable firmware version. Attackers could potentially take full control of the home security system.
💻 Affected Systems
- Anker Eufy Homebase 2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the home security system, allowing attackers to disable security features, access camera feeds, manipulate device settings, and potentially pivot to other network devices.
Likely Case
Unauthorized access to the home security system with administrative privileges, enabling surveillance bypass, device manipulation, and data exfiltration.
If Mitigated
Limited impact if network segmentation isolates the device and strong perimeter controls prevent external access.
🎯 Exploit Status
The vulnerability requires network access to the device but no authentication. Exploitation involves sending crafted packets to trigger the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.1.8.5h or later
Vendor Advisory: https://us.eufylife.com/pages/security
Restart Required: Yes
Instructions:
1. Log into Eufy Security app. 2. Navigate to device settings. 3. Check for firmware updates. 4. Apply update to version 2.1.8.5h or newer. 5. Reboot the Homebase 2 after update completes.
🔧 Temporary Workarounds
Network Segmentation
allIsolate the Homebase 2 from untrusted networks and the internet
Firewall Rules
linuxBlock external access to Homebase 2 management ports
iptables -A INPUT -s 0.0.0.0/0 -p tcp --dport [PORT] -j DROP
🧯 If You Can't Patch
- Disconnect the Homebase 2 from the internet and place it behind a firewall
- Monitor network traffic for unusual authentication attempts or privilege escalation patterns
🔍 How to Verify
Check if Vulnerable:
Check firmware version in Eufy Security app: Settings > General > About Homebase > Firmware VersionCheck Version:
Not applicable - check via mobile app interface onlyVerify Fix Applied:
Confirm firmware version is 2.1.8.5h or newer in the Eufy Security app📡 Detection & Monitoring
Log Indicators:
- Unusual authentication events
- Multiple failed authentication attempts followed by successful privileged access
- Unexpected device configuration changes
Network Indicators:
- Unusual network traffic to Homebase 2 management ports
- Suspicious packet patterns matching exploit signatures
SIEM Query:
source="homebase" AND (event_type="authentication" AND result="success" AND user="unknown") OR (event_type="privilege_escalation")