# CVE-2023-5188: WAGO Improper Input Validation in IEC61850 Server / Telecontrol

> Remote unauthenticated attackers can cause denial of service in WAGO Telecontrol Configurator by sending malformed packets to the MMS Interpreter.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Dec 2023
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-3c9v-fv3c-v7rc

## What is CVE-2023-5188?

CVE-2023-5188 is a high-severity denial of service vulnerability in WAGO Telecontrol Configurator, published on 5 Dec 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The MMS Interpreter of WagoAppRTU in versions below 1.4.6.0 which is used by the WAGO Telecontrol Configurator is vulnerable to malformed packets. An remote unauthenticated attacker could send specifically crafted packets that lead to a denial-of-service condition until restart of the affected device.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2023-5188?

It affects 2 products.


Products: Wago Telecontrol Configurator, Wago Wagoapprtu.

## How do I fix CVE-2023-5188?

No fix has been published for CVE-2023-5188 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-5188 being exploited?

There is no known exploitation of CVE-2023-5188 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-5188 and fix it if it is affected.

What it is: CVE-2023-5188 is a high-severity denial of service vulnerability in WAGO Telecontrol Configurator, published on 5 Dec 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-5188 in the wild and no public exploit code.

Affected product: WAGO Telecontrol Configurator. 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-2023-5188/ (Markdown: https://insights.sbomify.com/CVE-2023-5188/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-5188
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-5188
- OSV: https://osv.dev/vulnerability/CVE-2023-5188

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-5188/
Summaries are generated and may contain mistakes; the official description above is the record.