CVE-2024-39944
📋 TL;DR
This vulnerability in Dahua products allows attackers to send specially crafted data packets to vulnerable interfaces, causing denial of service through device crashes. It affects various Dahua security and surveillance devices. Organizations using affected Dahua equipment are at risk.
💻 Affected Systems
- Dahua security cameras
- Dahua DVR/NVR systems
- Dahua IP cameras
- Dahua surveillance equipment
📦 What is this software?
Ipc Hfs8449g Z7 Led Firmware by Dahuasecurity
Ipc Hfs8849g Z3 Led Firmware by Dahuasecurity
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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
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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 failure requiring physical replacement, extended service disruption across multiple security systems, and potential physical security compromise during downtime.
Likely Case
Temporary service disruption causing security camera/surveillance system outages, requiring manual reboots and creating security monitoring gaps.
If Mitigated
Isolated device crashes with minimal impact due to redundant systems and quick recovery procedures.
🎯 Exploit Status
CWE-770 indicates resource exhaustion vulnerability, suggesting relatively straightforward exploitation via crafted packets.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check specific firmware updates for each product model
Vendor Advisory: https://www.dahuasecurity.com/aboutUs/trustedCenter/details/768
Restart Required: Yes
Instructions:
1. Visit Dahua Trust Center advisory. 2. Identify affected product models. 3. Download latest firmware for each model. 4. Follow Dahua firmware upgrade procedures. 5. Verify successful update and functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Dahua devices from untrusted networks and internet exposure
Access Control Lists
allRestrict network access to Dahua device interfaces to authorized IPs only
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable devices
- Deploy intrusion prevention systems to detect and block crafted packet attacks
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against Dahua advisory and compare with patched versionsCheck Version:
Check via device web interface: System > Information > Version, or via CLI if availableVerify Fix Applied:
Verify firmware version matches or exceeds patched version listed in Dahua advisory📡 Detection & Monitoring
Log Indicators:
- Device crash/reboot logs
- Unexpected service termination
- Memory exhaustion warnings
Network Indicators:
- Unusual packet patterns to device management interfaces
- Multiple connection attempts with malformed data
SIEM Query:
source="dahua_device" AND (event="crash" OR event="reboot" OR event="service_stop")