CVE-2021-3555
📋 TL;DR
A buffer overflow vulnerability in the RTSP server component of Eufy Indoor 2K Indoor Camera allows local attackers to execute arbitrary code remotely. This affects Eufy Indoor 2K Indoor Camera version 2.0.9.3 and earlier. Attackers can potentially take full control of the camera.
💻 Affected Systems
- Eufy Indoor 2K Indoor Camera
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of camera with persistent remote access, ability to disable camera functions, access to video feeds, and pivot to internal network.
Likely Case
Remote code execution leading to camera compromise, video feed interception, and potential lateral movement within local network.
If Mitigated
Limited impact if camera is isolated from internet and other devices, with only local network access possible.
🎯 Exploit Status
Buffer overflow in RTSP server allows remote code execution without authentication. Technical details and proof-of-concept available in public research.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 2.0.9.3
Vendor Advisory: https://www.bitdefender.com/blog/labs/vulnerabilities-identified-in-eufy2k-indoor-camera/
Restart Required: Yes
Instructions:
1. Open Eufy Security app. 2. Go to camera settings. 3. Check for firmware updates. 4. Install any available updates. 5. Restart camera after update completes.
🔧 Temporary Workarounds
Disable RTSP Server
allTurn off RTSP streaming functionality to remove vulnerable component
In Eufy Security app: Settings > Camera Settings > RTSP > Disable
Network Segmentation
allIsolate camera on separate VLAN or network segment
🧯 If You Can't Patch
- Disable RTSP streaming in camera settings immediately
- Place camera behind firewall with strict inbound/outbound rules, blocking RTSP port (default 554)
🔍 How to Verify
Check if Vulnerable:
Check camera firmware version in Eufy Security app: Settings > Camera Settings > AboutCheck Version:
In Eufy Security app: Settings > Camera Settings > About > Firmware VersionVerify Fix Applied:
Confirm firmware version is newer than 2.0.9.3 and RTSP functionality still works if needed📡 Detection & Monitoring
Log Indicators:
- Unusual RTSP connection attempts
- Camera firmware version 2.0.9.3 or earlier
- Camera restart events
Network Indicators:
- Multiple RTSP protocol anomalies to camera IP
- Unexpected outbound connections from camera
SIEM Query:
source_ip="camera_ip" AND (protocol="RTSP" AND (payload_size>threshold OR malformed_requests))