# CVE-2018-7838: Denial of service in Modicon M580 CPU - BMEP582040 all versions before V2.90 and Modicon Ethernet Module BMENOC0301 all versions before V2.16

> A buffer error in Modicon M580 CPUs and Ethernet modules allows remote attackers to cause a denial of service on the FTP service via a long CWD command.

- **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:** 15 Jul 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-9v86-72g4-pvjh

## What is CVE-2018-7838?

CVE-2018-7838 is a high-severity denial of service vulnerability in Modicon M580 CPU - BMEP582040 all versions before V2.90 and Modicon Ethernet Module BMENOC0301 all versions before V2.16, published on 15 Jul 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A CWE-119 Buffer Errors vulnerability exists in Modicon M580 CPU - BMEP582040, all versions before V2.90, and Modicon Ethernet Module BMENOC0301, all versions before V2.16, which could cause denial of service on the FTP service of the controller or the Ethernet BMENOC module when it receives a FTP CWD command with a data length greater than 1020 bytes. A power cycle is then needed to reactivate the FTP service.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2018-7838?

It affects 13 products.


Products: Schneider-Electric Bmeh582040 Firmware, Schneider-Electric Bmeh586040 Firmware, Schneider-Electric Bmenoc0301 Firmware, Schneider-Electric Modicon M580 Bmep581020 Firmware, Schneider-Electric Modicon M580 Bmep582020 Firmware, Schneider-Electric Modicon M580 Bmep582040 Firmware, Schneider-Electric Modicon M580 Bmep582040s Firmware, Schneider-Electric Modicon M580 Bmep583020 Firmware, Schneider-Electric Modicon M580 Bmep583040 Firmware, Schneider-Electric Modicon M580 Bmep584020 Firmware, Schneider-Electric Modicon M580 Bmep584040 Firmware, Schneider-Electric Modicon M580 Bmep585040 Firmware, Schneider-Electric Modicon M580 Bmep586040 Firmware.

## How do I fix CVE-2018-7838?

No fix has been published for CVE-2018-7838 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-7838 being exploited?

There is no known exploitation of CVE-2018-7838 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-7838 and fix it if it is affected.

What it is: CVE-2018-7838 is a high-severity denial of service vulnerability in Modicon M580 CPU - BMEP582040 all versions before V2.90 and Modicon Ethernet Module BMENOC0301 all versions before V2.16, published on 15 Jul 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-2018-7838 in the wild and no public exploit code.

Affected product: Modicon M580 CPU - BMEP582040 all versions before V2.90 and Modicon Ethernet Module BMENOC0301 all versions before V2.16. 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-2018-7838/ (Markdown: https://insights.sbomify.com/CVE-2018-7838/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-7838
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-7838
- OSV: https://osv.dev/vulnerability/CVE-2018-7838

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From sbomify Insights: https://insights.sbomify.com/CVE-2018-7838/
Summaries are generated and may contain mistakes; the official description above is the record.