# CVE-2023-37200: XML external entity in EcoStruxure OPC UA Server Expert

> An attacker can exploit an XML External Entity vulnerability to read local files, requiring manual server restart for impact.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N`)
- **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:** 12 Jul 2023
- **Updated:** 7 Nov 2024
- **Also known as:** GHSA-mhjw-pxqp-cm9c

## What is CVE-2023-37200?

CVE-2023-37200 is a medium-severity vulnerability in Schneider Electric EcoStruxure OPC UA Server Expert, published on 12 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

A CWE-611: Improper Restriction of XML External Entity Reference vulnerability exists that
could cause loss of confidentiality when replacing a project file on the local filesystem and after
manual restart of the server.

Weakness: CWE-611 (Improper Restriction of XML External Entity Reference)

## Which versions are affected by CVE-2023-37200?

It affects 1 product.


Products: Se Ecostruxure Opc Ua Server Expert.

## How do I fix CVE-2023-37200?

No fix has been published for CVE-2023-37200 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-37200 being exploited?

There is no known exploitation of CVE-2023-37200 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-37200 and fix it if it is affected.

What it is: CVE-2023-37200 is a medium-severity vulnerability in Schneider Electric EcoStruxure OPC UA Server Expert, published on 12 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-2023-37200 in the wild and no public exploit code.

Affected product: Schneider Electric EcoStruxure OPC UA Server Expert. 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-2023-37200/ (Markdown: https://insights.sbomify.com/CVE-2023-37200/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-37200
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-37200
- OSV: https://osv.dev/vulnerability/CVE-2023-37200

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-37200/
Summaries are generated and may contain mistakes; the official description above is the record.