# CVE-2021-22639: Memory corruption in Tellus Lite V-Simulator and V-Server Lite

> An attacker can execute arbitrary code by tricking a user into opening a malicious project file in Tellus Lite V-Simulator or V-Server Lite.

- **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:** 27 Jan 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-6r97-fp62-rh53

## What is CVE-2021-22639?

CVE-2021-22639 is a high-severity memory corruption vulnerability in Tellus Lite V-Simulator and V-Server Lite, published on 27 Jan 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

An uninitialized pointer issue has been identified in the way the application processes project files, allowing an attacker to craft a special project file that may allow arbitrary code execution on the Tellus Lite V-Simulator and V-Server Lite (versions prior to 4.0.10.0).

Weakness: CWE-824 (Access of Uninitialized Pointer)

## Which versions are affected by CVE-2021-22639?

It affects 2 products.


Products: Fujielectric V-Server, Fujielectric V-Simulator.

## How do I fix CVE-2021-22639?

No fix has been published for CVE-2021-22639 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-22639 being exploited?

There is no known exploitation of CVE-2021-22639 in the wild and no public exploit code.

## Other vulnerabilities in Tellus Lite V-Simulator and V-Server Lite

- [CVE-2019-18240](https://insights.sbomify.com/CVE-2019-18240/): Memory corruption in Fuji Electric V-Server 4.0.6 and prior (critical 9.8)
- [CVE-2019-3947](https://insights.sbomify.com/CVE-2019-3947/): Hardcoded credentials in Fuji Electric V-Server (critical 9.8)
- [CVE-2023-47584](https://insights.sbomify.com/CVE-2023-47584/): Memory corruption in V-Server (high 7.8)
- [CVE-2023-47585](https://insights.sbomify.com/CVE-2023-47585/): Memory corruption in V-Server (high 7.8)
- [CVE-2023-47586](https://insights.sbomify.com/CVE-2023-47586/): Memory corruption in V-Server (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22639 and fix it if it is affected.

What it is: CVE-2021-22639 is a high-severity memory corruption vulnerability in Tellus Lite V-Simulator and V-Server Lite, published on 27 Jan 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-2021-22639 in the wild and no public exploit code.

Affected product: Tellus Lite V-Simulator and V-Server Lite. 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-2021-22639/ (Markdown: https://insights.sbomify.com/CVE-2021-22639/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22639
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22639
- OSV: https://osv.dev/vulnerability/CVE-2021-22639

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-22639/
Summaries are generated and may contain mistakes; the official description above is the record.