# CVE-2019-13542: Null dereference in 3S-Smart Software Solutions GmbH CODESYS V3 OPC UA Server

> An attacker with a trusted OPC UA client can cause a denial of service in CODESYS V3 OPC UA Server via crafted requests triggering a null pointer dereference.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Sep 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-87r9-pj76-c2hq

## What is CVE-2019-13542?

CVE-2019-13542 is a medium-severity vulnerability in 3S-Smart Software Solutions GmbH CODESYS V3 OPC UA Server, published on 17 Sep 2019. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

3S-Smart Software Solutions GmbH CODESYS V3 OPC UA Server, all versions 3.5.11.0 to 3.5.15.0, allows an attacker to send crafted requests from a trusted OPC UA client that cause a NULL pointer dereference, which may trigger a denial-of-service condition.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2019-13542?

It affects 10 products.


Products: Codesys Control for Beaglebone, Codesys Control for Empc-A\/Imx6, Codesys Control for Iot2000, Codesys Control for Pfc100, Codesys Control for Pfc200, Codesys Control for Raspberry Pi, Codesys Control Rte, Codesys Control Win, Codesys Linux, Codesys Runtime System Toolkit.

## How do I fix CVE-2019-13542?

No fix has been published for CVE-2019-13542 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-13542 being exploited?

There is no known exploitation of CVE-2019-13542 in the wild and no public exploit code.

## Other vulnerabilities in 3S-Smart Software Solutions GmbH CODESYS V3 OPC UA Server

- [CVE-2020-10245](https://insights.sbomify.com/CVE-2020-10245/): Memory corruption in n/a (critical 9.8)
- [CVE-2019-18858](https://insights.sbomify.com/CVE-2019-18858/): Memory corruption in n/a (critical 9.8)
- [CVE-2019-13548](https://insights.sbomify.com/CVE-2019-13548/): Memory corruption in CODESYS V3 web server (critical 9.8)
- [CVE-2018-25048](https://insights.sbomify.com/CVE-2018-25048/): Codesys Runtime Improper Limitation of a Pathname (high 8.8)
- [CVE-2019-9008](https://insights.sbomify.com/CVE-2019-9008/): Privilege escalation in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-13542 and fix it if it is affected.

What it is: CVE-2019-13542 is a medium-severity vulnerability in 3S-Smart Software Solutions GmbH CODESYS V3 OPC UA Server, published on 17 Sep 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-13542 in the wild and no public exploit code.

Affected product: 3S-Smart Software Solutions GmbH CODESYS V3 OPC UA Server. 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-2019-13542/ (Markdown: https://insights.sbomify.com/CVE-2019-13542/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-13542
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-13542
- OSV: https://osv.dev/vulnerability/CVE-2019-13542

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-13542/
Summaries are generated and may contain mistakes; the official description above is the record.