# CVE-2020-5736: Null dereference in Amcrest

> An authenticated remote attacker can crash Amcrest cameras and NVRs via a null pointer dereference on port 37777.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Apr 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-65jf-2vcm-9v6q

## What is CVE-2020-5736?

CVE-2020-5736 is a medium-severity vulnerability in Amcrest, published on 8 Apr 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Amcrest cameras and NVR are vulnerable to a null pointer dereference over port 37777. An authenticated remote attacker can abuse this issue to crash the device.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2020-5736?

It affects 18 products.


Products: Amcrest 1080-Lite 8ch Firmware, Amcrest Amdv10814-H5 Firmware, Amcrest Ip2m-841-V3 Firmware, Amcrest Ip2m-841 Firmware, Amcrest Ip2m-853ew Firmware, Amcrest Ip2m-858w Firmware, Amcrest Ip2m-866ew Firmware, Amcrest Ip2m-866w Firmware, Amcrest Ip4m-1053ew Firmware, Amcrest Ip8m-2454ew Firmware, Amcrest Ip8m-2493eb Firmware, Amcrest Ip8m-2496eb Firmware, Amcrest Ip8m-2597e Firmware, Amcrest Ip8m-Mb2546ew Firmware, Amcrest Ip8m-Mt2544ew Firmware, Amcrest Ip8m-T2499ew Firmware, Amcrest Ipm-721 Firmware, Amcrest Ipm-Hx1 Firmware.

## How do I fix CVE-2020-5736?

No fix has been published for CVE-2020-5736 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-5736 being exploited?

There is no known exploitation of CVE-2020-5736 in the wild and no public exploit code.

## Other vulnerabilities in Amcrest

- [CVE-2020-5735](https://insights.sbomify.com/CVE-2020-5735/): Amcrest Cameras and NVR Stack-based Buffer Overflow (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5736 and fix it if it is affected.

What it is: CVE-2020-5736 is a medium-severity vulnerability in Amcrest, published on 8 Apr 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-5736 in the wild and no public exploit code.

Affected product: Amcrest. 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-2020-5736/ (Markdown: https://insights.sbomify.com/CVE-2020-5736/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5736
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5736
- OSV: https://osv.dev/vulnerability/CVE-2020-5736

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-5736/
Summaries are generated and may contain mistakes; the official description above is the record.