# CVE-2020-5639: Path traversal in FileZen

> Remote attackers can exploit a directory traversal flaw in FileZen to upload arbitrary files and execute OS commands.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-r7q6-f5hp-q2cq

## What is CVE-2020-5639?

CVE-2020-5639 is a critical path traversal vulnerability in Soliton Systems K.K. FileZen, published on 14 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Directory traversal vulnerability in FileZen versions from V3.0.0 to V4.2.2 allows remote attackers to upload an arbitrary file in a specific directory via unspecified vectors. As a result, an arbitrary OS command may be executed.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2020-5639?

It affects 1 product.


Products: Soliton Filezen.

## How do I fix CVE-2020-5639?

No fix has been published for CVE-2020-5639 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-5639 being exploited?

There is no known exploitation of CVE-2020-5639 in the wild and no public exploit code.

## Other vulnerabilities in Soliton Systems K.K. FileZen

- [CVE-2026-25108](https://insights.sbomify.com/CVE-2026-25108/): Soliton Systems K.K FileZen OS Command Injection (high 8.7, exploited in the wild)
- [CVE-2018-0694](https://insights.sbomify.com/CVE-2018-0694/): Command injection in FileZen (critical 9.8)
- [CVE-2018-0693](https://insights.sbomify.com/CVE-2018-0693/): Path traversal in FileZen (high 7.5)
- [CVE-2021-20655](https://insights.sbomify.com/CVE-2021-20655/): Command injection in FileZen (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5639 and fix it if it is affected.

What it is: CVE-2020-5639 is a critical path traversal vulnerability in Soliton Systems K.K. FileZen, published on 14 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-5639 in the wild and no public exploit code.

Affected product: Soliton Systems K.K. FileZen. 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-2020-5639/ (Markdown: https://insights.sbomify.com/CVE-2020-5639/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5639
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5639
- OSV: https://osv.dev/vulnerability/CVE-2020-5639

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-5639/
Summaries are generated and may contain mistakes; the official description above is the record.