# CVE-2020-7850: Douzone ActiveX File Download and Execution Vulnerability

> Remote attackers can execute arbitrary code by tricking users into visiting a malicious webpage that exploits the NBBDownloader ActiveX control.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 29 Mar 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-fmfv-jgwf-v4g5

## What is CVE-2020-7850?

CVE-2020-7850 is a high-severity code injection vulnerability in DOUZONE ICT GROUP. NBBDownloader.ocx, published on 29 Mar 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

NBBDownloader.ocx ActiveX Control in Groupware contains a vulnerability that could allow remote files to be downloaded and executed by setting the arguments to the activex method. A remote attacker could induce a user to access a crafted web page, causing damage such as malicious code infection.

Weakness: CWE-88 (Improper Neutralization of Argument Delimiters in a Command)

## Which versions are affected by CVE-2020-7850?

It affects 1 product.


Products: Douzone Nbbdownloader.ocx.

## How do I fix CVE-2020-7850?

No fix has been published for CVE-2020-7850 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-7850 being exploited?

There is no known exploitation of CVE-2020-7850 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-7850 and fix it if it is affected.

What it is: CVE-2020-7850 is a high-severity code injection vulnerability in DOUZONE ICT GROUP. NBBDownloader.ocx, published on 29 Mar 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-7850 in the wild and no public exploit code.

Affected product: DOUZONE ICT GROUP. NBBDownloader.ocx. 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-2020-7850/ (Markdown: https://insights.sbomify.com/CVE-2020-7850/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-7850
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-7850
- OSV: https://osv.dev/vulnerability/CVE-2020-7850

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-7850/
Summaries are generated and may contain mistakes; the official description above is the record.