# CVE-2018-7521: Use after free in Omron CX-Supervisor

> Attackers can execute arbitrary code by tricking users into opening a malicious project file in Omron CX-Supervisor.

- **Severity:** Medium 5.3 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Mar 2018
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-jxqm-2cjv-rxvx

## What is CVE-2018-7521?

CVE-2018-7521 is a medium-severity use after free vulnerability in ICS-CERT Omron CX-Supervisor, published on 21 Mar 2018. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In Omron CX-Supervisor Versions 3.30 and prior, use after free vulnerabilities can be exploited when CX Supervisor parses a specially crafted project file.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2018-7521?

It affects 1 product.


Products: Omron Cx-Supervisor.

## How do I fix CVE-2018-7521?

No fix has been published for CVE-2018-7521 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-7521 being exploited?

There is no known exploitation of CVE-2018-7521 in the wild and no public exploit code.

## Other vulnerabilities in ICS-CERT Omron CX-Supervisor

- [CVE-2019-18251](https://insights.sbomify.com/CVE-2019-18251/): Other in Omron CX-Supervisor (high 8.8)
- [CVE-2018-19011](https://insights.sbomify.com/CVE-2018-19011/): Code injection in CX-Supervisor (high 8.8)
- [CVE-2018-19017](https://insights.sbomify.com/CVE-2018-19017/): Use after free in CX-Supervisor (high 8.8)
- [CVE-2018-17905](https://insights.sbomify.com/CVE-2018-17905/): Memory corruption in CX-Supervisor (high 7.8)
- [CVE-2018-17909](https://insights.sbomify.com/CVE-2018-17909/): Use after free in CX-Supervisor (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-7521 and fix it if it is affected.

What it is: CVE-2018-7521 is a medium-severity use after free vulnerability in ICS-CERT Omron CX-Supervisor, published on 21 Mar 2018. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-7521 in the wild and no public exploit code.

Affected product: ICS-CERT Omron CX-Supervisor. 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-2018-7521/ (Markdown: https://insights.sbomify.com/CVE-2018-7521/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-7521
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-7521
- OSV: https://osv.dev/vulnerability/CVE-2018-7521

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-7521/
Summaries are generated and may contain mistakes; the official description above is the record.