CVE-2021-21955
📋 TL;DR
An authentication bypass vulnerability in Anker Eufy Homebase 2 allows attackers to recover passwords by sniffing network traffic. This affects users of the vulnerable firmware version who have their devices connected to untrusted networks. Attackers can potentially gain unauthorized access to the home security system.
💻 Affected Systems
- Anker Eufy Homebase 2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of home security system, unauthorized access to cameras and sensors, potential physical security breach.
Likely Case
Unauthorized access to home security system, privacy violation through camera access, potential device takeover.
If Mitigated
Limited impact if device is isolated on trusted network with proper segmentation.
🎯 Exploit Status
Exploitation requires network access but no authentication. Attack involves sniffing network traffic and analyzing packet IDs.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor for latest firmware (likely 2.1.7.x 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 available update. 5. Device will restart automatically.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Homebase 2 on separate VLAN or network segment
Disable Remote Access
allTurn off internet connectivity for Homebase 2 if local-only access is sufficient
🧯 If You Can't Patch
- Physically disconnect from internet and use local-only access
- Place behind firewall with strict inbound/outbound rules
🔍 How to Verify
Check if Vulnerable:
Check firmware version in Eufy Security app under device settings. If version is 2.1.6.9h or earlier, device is vulnerable.Check Version:
Not applicable - version check through mobile app onlyVerify Fix Applied:
Confirm firmware version is updated to latest (post-2.1.6.9h) in Eufy Security app.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful access
- Unusual network traffic patterns to/from Homebase 2
Network Indicators:
- Unusual packet sniffing activity on network segment containing Homebase 2
- Unexpected authentication traffic to Homebase 2
SIEM Query:
Not applicable - consumer IoT device typically lacks enterprise logging