# CVE-2020-5735: Amcrest Cameras and NVR Stack-based Buffer Overflow

> An authenticated remote attacker can trigger a stack-based buffer overflow in Amcrest cameras and NVRs to crash the device or execute arbitrary code.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Yes, since 3 Nov 2021 (CISA KEV)
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Apr 2020
- **Updated:** 21 Oct 2025
- **Also known as:** GHSA-q9mh-3fx2-4gj3

## What is CVE-2020-5735?

CVE-2020-5735 is a high-severity memory corruption 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 stack-based buffer overflow over port 37777. An authenticated remote attacker can abuse this issue to crash the device and possibly execute arbitrary code.

Weakness: CWE-787 (Out-of-bounds Write), CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2020-5735?

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-2020-5735?

No fix has been published for CVE-2020-5735 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 3 May 2022.

## Is CVE-2020-5735 being exploited?

Yes. Attackers have exploited CVE-2020-5735 in the wild since at least 3 Nov 2021.

Public exploit code:

- Amcrest Dahua NVR Camera IP2M-841 - Denial of Service (PoC) (exploitdb)

## Other vulnerabilities in Amcrest

- [CVE-2020-5736](https://insights.sbomify.com/CVE-2020-5736/): Null dereference in Amcrest (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5735 and fix it if it is affected.

What it is: CVE-2020-5735 is a high-severity memory corruption 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: Yes. Attackers have exploited CVE-2020-5735 in the wild since at least 3 Nov 2021.

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-2020-5735/ (Markdown: https://insights.sbomify.com/CVE-2020-5735/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5735
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5735
- OSV: https://osv.dev/vulnerability/CVE-2020-5735

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-5735/
Summaries are generated and may contain mistakes; the official description above is the record.