CVE-2024-39948
📋 TL;DR
This vulnerability in Dahua products allows attackers to cause denial of service by sending specially crafted packets to vulnerable interfaces. The device will crash and become unavailable. This affects various Dahua security cameras, recorders, and related devices.
💻 Affected Systems
- Dahua security cameras
- Dahua NVR/DVR recorders
- Dahua video management systems
📦 What is this software?
Nvr4104 4ks3 Firmware by Dahuasecurity
Nvr4104 P 4ks3 Firmware by Dahuasecurity
Nvr4104 P 4ks3\(960g\) Firmware by Dahuasecurity
Nvr4104hs 4ks3 Firmware by Dahuasecurity
Nvr4104hs 4ks3\(960g\) Firmware by Dahuasecurity
Nvr4104hs P 4ks2\/l Firmware by Dahuasecurity
Nvr4104hs P 4ks3\(960g\) Firmware by Dahuasecurity
Nvr4108 4ks3 Firmware by Dahuasecurity
Nvr4108 P 4ks3 Firmware by Dahuasecurity
Nvr4108hs 4ks3 Firmware by Dahuasecurity
Nvr4108hs 4ks3\(960g\) Firmware by Dahuasecurity
Nvr4108hs 8p 4ks2\/l Firmware by Dahuasecurity
Nvr4108hs P 4ks2\/l Firmware by Dahuasecurity
Nvr4116 4ks3 Firmware by Dahuasecurity
Nvr4116hs 4ks3 Firmware by Dahuasecurity
Nvr4116hs 8p 4ks2\/l Firmware by Dahuasecurity
Nvr4204 4ks3 Firmware by Dahuasecurity
Nvr4204 P 4ks3 Firmware by Dahuasecurity
Nvr4208 4ks3 Firmware by Dahuasecurity
Nvr4216 16p 4ks2\/l Firmware by Dahuasecurity
Nvr4216 4ks3 Firmware by Dahuasecurity
Nvr4232 16p 4ks2\/l Firmware by Dahuasecurity
Nvr4232 4ks3 Firmware by Dahuasecurity
Nvr4416 16p 4ks2\/i Firmware by Dahuasecurity
Nvr4432 16p 4ks2\/i Firmware by Dahuasecurity
Nvr4816 16p 4ks2\/i Firmware by Dahuasecurity
Nvr4832 16p 4ks2\/i Firmware by Dahuasecurity
⚠️ Risk & Real-World Impact
Worst Case
Permanent device crash requiring physical reset or replacement, extended service disruption for security monitoring systems.
Likely Case
Temporary denial of service requiring device reboot, interrupting surveillance and recording capabilities.
If Mitigated
Minimal impact if devices are behind firewalls with strict network controls and regular monitoring.
🎯 Exploit Status
CWE-476 indicates NULL pointer dereference, typically low complexity to exploit for DoS. No authentication required based on description.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched firmware versions
Vendor Advisory: https://www.dahuasecurity.com/aboutUs/trustedCenter/details/768
Restart Required: Yes
Instructions:
1. Access Dahua vendor advisory URL
2. Identify affected product models
3. Download latest firmware from Dahua portal
4. Follow vendor firmware upgrade procedure
5. Reboot device after update
🔧 Temporary Workarounds
Network Segmentation
allIsolate Dahua devices in separate VLAN with strict firewall rules
Access Control Lists
allImplement IP whitelisting to restrict which systems can communicate with Dahua devices
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to block unnecessary traffic to device interfaces
- Monitor device health and implement automated alerting for device crashes or reboots
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against vendor advisory. If running vulnerable version and exposed to network traffic, assume vulnerable.Check Version:
Check via device web interface: System > Information > Version, or via SSH: cat /etc/versionVerify Fix Applied:
Verify firmware version has been updated to patched version listed in vendor advisory. Test device stability under normal operation.📡 Detection & Monitoring
Log Indicators:
- Device crash/reboot logs
- Unexpected service restarts
- Connection drops in monitoring systems
Network Indicators:
- Unusual packet patterns to device management interfaces
- Multiple connection attempts to vulnerable ports
SIEM Query:
source="dahua-device" AND (event="crash" OR event="reboot" OR event="service_restart")