# CVE-2019-6833: Denial of service in Magelis HMI Panels

> An attacker can cause a temporary freeze of Schneider Electric Magelis HMI panels by sending a high rate of frames, leading to a denial of service.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:** A user has to click or open something
- **Fix available:** No
- **Published:** 17 Sep 2019
- **Updated:** 30 Sep 2025
- **Also known as:** GHSA-w8qp-5q95-q255

## What is CVE-2019-6833?

CVE-2019-6833 is a medium-severity denial of service vulnerability in Schneider Electric SE Magelis HMI Panels, published on 17 Sep 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A CWE-754 – Improper Check for Unusual or Exceptional Conditions vulnerability exists in Magelis HMI Panels (all versions of - HMIGTO, HMISTO, XBTGH, HMIGTU, HMIGTUX, HMISCU, HMISTU, XBTGT, XBTGT, HMIGXO, HMIGXU), which could cause a temporary freeze of the HMI when a high rate of frames is received. When the attack stops, the buffered commands are processed by the HMI panel.

Weakness: CWE-754 (Improper Check for Unusual or Exceptional Conditions)

## Which versions are affected by CVE-2019-6833?

It affects 9 products.


Products: Schneider-Electric Hmigto Firmware, Schneider-Electric Hmigtu Firmware, Schneider-Electric Hmigxo Firmware, Schneider-Electric Hmigxu Firmware, Schneider-Electric Hmiscu Firmware, Schneider-Electric Hmisto Firmware, Schneider-Electric Hmistu Firmware, Schneider-Electric Xbtgh Firmware, Schneider-Electric Xbtgt Firmware.

## How do I fix CVE-2019-6833?

No fix has been published for CVE-2019-6833 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-6833 being exploited?

There is no known exploitation of CVE-2019-6833 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-6833 and fix it if it is affected.

What it is: CVE-2019-6833 is a medium-severity denial of service vulnerability in Schneider Electric SE Magelis HMI Panels, published on 17 Sep 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-6833 in the wild and no public exploit code.

Affected product: Schneider Electric SE Magelis HMI Panels. 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-2019-6833/ (Markdown: https://insights.sbomify.com/CVE-2019-6833/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-6833
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-6833
- OSV: https://osv.dev/vulnerability/CVE-2019-6833

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-6833/
Summaries are generated and may contain mistakes; the official description above is the record.