CVE-2024-39946
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability has been found in Dahua products.After obtaining the administrator's username and password, the attacker can send a carefully crafted data packet to the interface with vulnerabilities, causing device initialization.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThis is an authenticated vulnerability in Dahua devices where an attacker with valid administrator credentials can send a crafted data packet to a vulnerable interface, triggering unauthorized device initialization (likely a factory reset). The attacker must first obtain admin username and password through other means before exploiting this flaw.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 4.003.0000000.1.r.240515= 4.003.0000000.1.r.240515< 4.003.0000000.1.r.240515< 4.003.0000000.1.r.240515< 4.003.0000000.1.r.240515< 4.003.0000000.1.r.240515< 4.003.0000000.1.r.240515< 4.003.0000000.1.r.240515CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify NVR model and firmware versionAccess the device web interface or use ONVIF/SDK tools to query the device info. Check System > Info or similar for exact model number (e.g., Nvr4104 4ks2/l) and firmware version string.Affected if The device model matches any of: Nvr4104 4ks2/l, Nvr4108 4ks2/l, Nvr4116 4ks2/l, Nvr4104 P 4ks2/l, Nvr4108 P 4ks2/l, Nvr4108 8p 4ks2/l, Nvr4116 8p 4ks2/l, Nvr4104hs 4ks2/l AND firmware version is less than 4.003.0000000.1.r.240515 (or exactly 4.003.0000000.1.r.240515 for Nvr4108 4ks2/l).
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Verify remote management interface exposureCheck network configuration to determine if the device HTTP/HTTPS management port (typically 80/443) is exposed to untrusted networks or the internet. Use external port scanning tools or review firewall rules.Affected if The device management interface is reachable from untrusted networks or directly from the internet without VPN or access controls.
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Review admin account securityCheck for weak, default, or reused admin passwords. Verify if default Dahua admin credentials (admin/admin) are still in use or if credentials are shared across multiple devices.Affected if Admin credentials are weak, default, or compromised, allowing authenticated attackers to exploit this vulnerability.
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Monitor for unexpected device reinitializationsReview device logs or system event logs for unexpected factory reset events, device reboots with 'initialize' or 'default' flags, or configuration changes occurring without legitimate admin action.Affected if Factory reset or device initialization events appear in logs without corresponding legitimate admin actions.
The device is affected if it is one of the listed NVR models running firmware below 4.003.0000000.1.r.240515, has its management interface exposed to untrusted networks, and uses admin credentials that could be obtained by an attacker.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped4.003.0000000.1.r.240515
Since exploitation requires valid admin credentials, prioritize credential protection through strong, unique passwords and secure storage. Isolate device management interfaces on restricted networks, apply any available firmware updates from Dahua, and monitor for unexpected device reinitializations.
Firmware version 4.003.0000000.1.r.240515 or later for all affected NVR models
- 1. Identify the exact NVR model (e.g., Nvr4104 4ks2/l, Nvr4108 4ks2/l, etc.) from the affected product list
- 2. Access the device web interface or DM manager console
- 3. Navigate to the firmware upgrade section (typically under System > Maintenance > Upgrade)
- 4. Download the firmware version 4.003.0000000.1.r.240515 or later from the official Dahua Security website (www.dahuasecurity.com)
- 5. Upload the firmware file and initiate the upgrade process
- 6. Wait for the device to reboot and verify the firmware version has been updated successfully
- 7. After upgrade, verify that the device configuration is intact and functioning normally
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-39946 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-39946 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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