# CVE-2019-6556: Use after free in CX-Programmer within CX-One

> An attacker can execute arbitrary code by tricking a user into opening a specially crafted project file in Omron CX-Programmer.

- **Severity:** Medium 6.6 (`CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/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:** 10 Apr 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-vv73-vf82-3769

## What is CVE-2019-6556?

CVE-2019-6556 is a medium-severity use after free vulnerability in Omron CX-Programmer within CX-One, published on 10 Apr 2019. 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

When processing project files, the application (Omron CX-Programmer v9.70 and prior and Common Components January 2019 and prior) fails to check if it is referencing freed memory. An attacker could use a specially crafted project file to exploit and execute code under the privileges of the application.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2019-6556?

It affects 2 products.


Products: Omron Common Components, Omron Cx-Programmer.

## How do I fix CVE-2019-6556?

No fix has been published for CVE-2019-6556 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-6556 being exploited?

There is no known exploitation of CVE-2019-6556 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-6556 and fix it if it is affected.

What it is: CVE-2019-6556 is a medium-severity use after free vulnerability in Omron CX-Programmer within CX-One, published on 10 Apr 2019. 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-2019-6556 in the wild and no public exploit code.

Affected product: Omron CX-Programmer within CX-One. 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-2019-6556/ (Markdown: https://insights.sbomify.com/CVE-2019-6556/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-6556
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-6556
- OSV: https://osv.dev/vulnerability/CVE-2019-6556

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-6556/
Summaries are generated and may contain mistakes; the official description above is the record.