CVE-2021-33547
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on affected IP cameras by exploiting a stack-based buffer overflow in the profile parameter. It affects multiple camera devices from UDP Technology, Geutebrück, and other vendors. Organizations using these vulnerable cameras are at risk of compromise.
💻 Affected Systems
- UDP Technology IP cameras
- Geutebrück IP cameras
- Various rebranded cameras using UDP Technology firmware
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attacker to gain persistent access, disable cameras, exfiltrate video feeds, or pivot to internal networks.
Likely Case
Camera compromise leading to video feed interception, denial of service, or use as foothold for further network attacks.
If Mitigated
Limited impact if cameras are isolated in separate VLANs with strict network controls and regular monitoring.
🎯 Exploit Status
Public exploit code exists and the vulnerability requires no authentication to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Varies by vendor - check specific vendor advisories
Vendor Advisory: https://us-cert.cisa.gov/ics/advisories/icsa-21-208-03
Restart Required: Yes
Instructions:
1. Identify camera model and vendor. 2. Check vendor website for firmware updates. 3. Download latest firmware. 4. Upload firmware via camera web interface. 5. Reboot camera after update.
🔧 Temporary Workarounds
Network Segmentation
allIsolate cameras in separate VLAN with strict firewall rules
Disable Web Interface
allDisable HTTP/HTTPS access if not required for operation
🧯 If You Can't Patch
- Place cameras behind firewalls with strict inbound rules blocking all external access
- Implement network monitoring for unusual traffic patterns from camera devices
🔍 How to Verify
Check if Vulnerable:
Check camera firmware version against vendor patched versions. Test with authorized vulnerability scanner.Check Version:
Check camera web interface → System → Firmware/Version pageVerify Fix Applied:
Verify firmware version matches patched version from vendor advisory. Test with authorized vulnerability scanner.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to profile parameter
- Multiple failed buffer overflow attempts
- Unexpected camera reboots
Network Indicators:
- HTTP requests with long strings in profile parameter
- Unusual outbound connections from cameras
SIEM Query:
source="camera_logs" AND (uri="*profile=*" AND length(uri)>100) OR event="buffer_overflow"