CVE-2024-39946
📋 TL;DR
This vulnerability in Dahua products allows attackers with administrator credentials to send specially crafted packets to vulnerable interfaces, causing device initialization (factory reset). This affects Dahua security cameras, NVRs, and other IoT devices running vulnerable firmware.
💻 Affected Systems
- Dahua security cameras
- Dahua NVRs
- Dahua DVRs
- Other Dahua IoT devices
📦 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
Complete device compromise leading to factory reset, loss of configuration and recordings, and potential persistence for further attacks.
Likely Case
Service disruption through device reset, requiring physical access or network reconfiguration to restore functionality.
If Mitigated
Limited impact if strong credential management and network segmentation are implemented.
🎯 Exploit Status
Exploitation requires prior credential compromise through other means (phishing, weak passwords, credential reuse).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific fixed firmware versions
Vendor Advisory: https://www.dahuasecurity.com/aboutUs/trustedCenter/details/768
Restart Required: Yes
Instructions:
1. Access Dahua vendor advisory. 2. Identify affected product models. 3. Download latest firmware from Dahua portal. 4. Follow vendor firmware upgrade procedure. 5. Verify successful update and configuration.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Dahua devices on separate VLANs with restricted access.
Credential Hardening
allEnforce strong, unique admin passwords and implement multi-factor authentication if supported.
🧯 If You Can't Patch
- Implement strict network access controls to limit device exposure
- Monitor for suspicious authentication attempts and packet patterns
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against vendor advisory; devices with unpatched firmware are vulnerable.Check Version:
Varies by device model; typically accessible via web interface or SSH to check firmware version.Verify Fix Applied:
Confirm firmware version matches patched version from vendor advisory and test functionality.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by device initialization events
- Unexpected factory reset logs
Network Indicators:
- Unusual packets to device management interfaces
- Traffic patterns indicating credential brute forcing
SIEM Query:
Example: 'source_ip attempts > 10 to device_admin_interface within 1m' OR 'device_log contains "factory reset" or "initialization"'