# CVE-2019-6831: Denial of service in BMXNOR0200H Ethernet / Serial RTU module

> An attacker can cause disconnection of active connections in Schneider Electric RTU modules by sending a high volume of IEC 60870-5-104 packets.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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:** 17 Sep 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-gvw6-phvj-chmf

## What is CVE-2019-6831?

CVE-2019-6831 is a high-severity denial of service vulnerability in Schneider Electric SE BMXNOR0200H Ethernet / Serial RTU module, published on 17 Sep 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in BMXNOR0200H Ethernet / Serial RTU module (all firmware versions), which could cause disconnection of active connections when an unusually high number of IEC 60870- 5-104 packets are received by the module on port 2404/TCP.

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

## Which versions are affected by CVE-2019-6831?

It affects 1 product.


Products: Schneider-Electric Bmxnor0200h Firmware.

## How do I fix CVE-2019-6831?

No fix has been published for CVE-2019-6831 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-6831 being exploited?

There is no known exploitation of CVE-2019-6831 in the wild and no public exploit code.

## Other vulnerabilities in Schneider Electric SE BMXNOR0200H Ethernet / Serial RTU module

- [CVE-2019-6810](https://insights.sbomify.com/CVE-2019-6810/): Missing authorization in BMXNOR0200H Ethernet / Serial RTU module (high 8.8)
- [CVE-2019-6813](https://insights.sbomify.com/CVE-2019-6813/): Denial of service in BMXNOR0200H Ethernet / Serial RTU module (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-6831 and fix it if it is affected.

What it is: CVE-2019-6831 is a high-severity denial of service vulnerability in Schneider Electric SE BMXNOR0200H Ethernet / Serial RTU module, published on 17 Sep 2019. 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-2019-6831 in the wild and no public exploit code.

Affected product: Schneider Electric SE BMXNOR0200H Ethernet / Serial RTU module. 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-2019-6831/ (Markdown: https://insights.sbomify.com/CVE-2019-6831/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-6831
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-6831
- OSV: https://osv.dev/vulnerability/CVE-2019-6831

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-6831/
Summaries are generated and may contain mistakes; the official description above is the record.