# CVE-2023-3670: Codesys: Vulnerability in CODESYS Development System and CODESYS Scripting

> Local attackers can execute malicious scripts via unsafe directory permissions in CODESYS Development System and Scripting.

- **Severity:** High 7.3 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 28 Jul 2023
- **Updated:** 21 Oct 2024
- **Also known as:** GHSA-h29m-qm63-f57f

## What is CVE-2023-3670?

CVE-2023-3670 is a high-severity path traversal vulnerability in CODESYS Development System, published on 28 Jul 2023. 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

In CODESYS Development System 3.5.9.0 to 3.5.17.0 and CODESYS Scripting 4.0.0.0 to 4.1.0.0 unsafe directory permissions would allow an attacker with local access to the workstation to place potentially harmful and disguised scripts that could be executed by legitimate users.

Weakness: CWE-668 (Exposure of Resource to Wrong Sphere)

## Which versions are affected by CVE-2023-3670?

It affects 2 products.


Products: Codesys Development System, Codesys Scripting.

## How do I fix CVE-2023-3670?

No fix has been published for CVE-2023-3670 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-3670 being exploited?

There is no known exploitation of CVE-2023-3670 in the wild and no public exploit code.

## Other vulnerabilities in CODESYS Development System

- [CVE-2023-3663](https://insights.sbomify.com/CVE-2023-3663/): CODESYS: Missing integrity check in CODESYS Development System (high 8.8)
- [CVE-2021-21863](https://insights.sbomify.com/CVE-2021-21863/): Deserialization in CODESYS (high 8.8)
- [CVE-2021-21865](https://insights.sbomify.com/CVE-2021-21865/): Deserialization in CODESYS (high 8.8)
- [CVE-2021-21866](https://insights.sbomify.com/CVE-2021-21866/): Deserialization in CODESYS (high 8.8)
- [CVE-2026-44468](https://insights.sbomify.com/CVE-2026-44468/): Incorrect Default Permissions in CODESYS Development System (high 8.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-3670 and fix it if it is affected.

What it is: CVE-2023-3670 is a high-severity path traversal vulnerability in CODESYS Development System, published on 28 Jul 2023. 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-2023-3670 in the wild and no public exploit code.

Affected product: CODESYS Development System. 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-2023-3670/ (Markdown: https://insights.sbomify.com/CVE-2023-3670/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-3670
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-3670
- OSV: https://osv.dev/vulnerability/CVE-2023-3670

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-3670/
Summaries are generated and may contain mistakes; the official description above is the record.