# CVE-2024-39949: Denial of service in NVR4XXX

> Attackers can crash Dahua NVR devices by sending crafted data packets to a vulnerable interface, causing service disruption.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 31 Jul 2024
- **Updated:** 30 Sep 2025
- **Also known as:** GHSA-vx79-rj6m-r29g

## What is CVE-2024-39949?

CVE-2024-39949 is a high-severity denial of service vulnerability in Dahua NVR4XXX, published on 31 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been found in Dahua products. Attackers can send carefully crafted data packets to the interface with vulnerabilities, causing the device to crash.

Weakness: CWE-20 (Improper Input Validation), CWE-617 (Reachable Assertion)

## Which versions are affected by CVE-2024-39949?

It affects 56 products.


Products: Dahuasecurity Nvr4104-4ks2\/L Firmware, Dahuasecurity Nvr4104-4ks3 Firmware, Dahuasecurity Nvr4104-P-4ks2\/L Firmware, Dahuasecurity Nvr4104-P-4ks3\(960g\) Firmware, Dahuasecurity Nvr4104-P-4ks3 Firmware, Dahuasecurity Nvr4104hs-4ks2\/L Firmware, Dahuasecurity Nvr4104hs-4ks3\(960g\) Firmware, Dahuasecurity Nvr4104hs-4ks3 Firmware, Dahuasecurity Nvr4104hs-P-4ks2\/L Firmware, Dahuasecurity Nvr4104hs-P-4ks3\(960g\) Firmware, Dahuasecurity Nvr4104hs-P-4ks3 Firmware, Dahuasecurity Nvr4108-4ks2\/L Firmware, Dahuasecurity Nvr4108-4ks3 Firmware, Dahuasecurity Nvr4108-8p-4ks2\/L Firmware, Dahuasecurity Nvr4108-8p-4ks3 Firmware, Dahuasecurity Nvr4108-P-4ks2\/L Firmware, Dahuasecurity Nvr4108-P-4ks3 Firmware, Dahuasecurity Nvr4108hs-4ks2\/L Firmware, Dahuasecurity Nvr4108hs-4ks3\(960g\) Firmware, Dahuasecurity Nvr4108hs-4ks3 Firmware and 36 more.

## How do I fix CVE-2024-39949?

No fix has been published for CVE-2024-39949 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-39949 being exploited?

There is no known exploitation of CVE-2024-39949 in the wild and no public exploit code.

## Other vulnerabilities in Dahua NVR4XXX

- [CVE-2024-39948](https://insights.sbomify.com/CVE-2024-39948/): Null dereference in NVR4XXX (high 7.5)
- [CVE-2024-39947](https://insights.sbomify.com/CVE-2024-39947/): Denial of service in NVR4XXX (medium 6.5)
- [CVE-2024-39946](https://insights.sbomify.com/CVE-2024-39946/): Denial of service in NVR4XXX (medium 6.0)
- [CVE-2024-39945](https://insights.sbomify.com/CVE-2024-39945/): Denial of service in NVR4XXX (medium 4.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-39949 and fix it if it is affected.

What it is: CVE-2024-39949 is a high-severity denial of service vulnerability in Dahua NVR4XXX, published on 31 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-39949 in the wild and no public exploit code.

Affected product: Dahua NVR4XXX. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2024-39949/ (Markdown: https://insights.sbomify.com/CVE-2024-39949/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-39949
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-39949
- OSV: https://osv.dev/vulnerability/CVE-2024-39949

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-39949/
Summaries are generated and may contain mistakes; the official description above is the record.