# CVE-2021-38421: Fuji Electric Tellus Lite V-Simulator out of bounds read

> An out-of-bounds read in Fuji Electric Tellus Lite V-Simulator allows attackers to read sensitive memory or cause a crash.

- **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:** 20 Dec 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-mxfm-3457-5xpx

## What is CVE-2021-38421?

CVE-2021-38421 is a high-severity vulnerability in Fuji Electric Tellus Lite V-Simulator, published on 20 Dec 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

Fuji Electric V-Server Lite and Tellus Lite V-Simulator prior to v4.0.12.0 is vulnerable to an out-of-bounds read, which may allow an attacker to read sensitive information from other memory locations or cause a crash.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2021-38421?

It affects 2 products.


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

## How do I fix CVE-2021-38421?

No fix has been published for CVE-2021-38421 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-38421 being exploited?

There is no known exploitation of CVE-2021-38421 in the wild and no public exploit code.

## Other vulnerabilities in Fuji Electric Tellus Lite V-Simulator

- [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-2021-38421 and fix it if it is affected.

What it is: CVE-2021-38421 is a high-severity vulnerability in Fuji Electric Tellus Lite V-Simulator, published on 20 Dec 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-2021-38421 in the wild and no public exploit code.

Affected product: Fuji Electric Tellus Lite V-Simulator. 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-2021-38421/ (Markdown: https://insights.sbomify.com/CVE-2021-38421/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-38421
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-38421
- OSV: https://osv.dev/vulnerability/CVE-2021-38421

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-38421/
Summaries are generated and may contain mistakes; the official description above is the record.