# CVE-2024-5056: Information disclosure in Modicon M340

> Attackers can access external files or directories, potentially preventing firmware updates and disrupting webserver behavior on Schneider Electric Modicon network modules.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Jun 2024
- **Updated:** 1 Aug 2024
- **Also known as:** GHSA-fm6m-fmh2-f72v

## What is CVE-2024-5056?

CVE-2024-5056 is a medium-severity vulnerability in Schneider Electric Modicon M340, published on 12 Jun 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

CWE-552: Files or Directories Accessible to External Parties vulnerability exists which may
prevent user to update the device firmware and prevent proper behavior of the webserver when
specific files or directories are removed from the filesystem.

Weakness: CWE-552 (Files or Directories Accessible to External Parties)

## Which versions are affected by CVE-2024-5056?

It affects 3 products.


Products: Schneider-Electric Bmxnoe0100 Firmware, Schneider-Electric Bmxnoe0110 Firmware, Schneider-Electric Modicon M340 Firmware.

## How do I fix CVE-2024-5056?

No fix has been published for CVE-2024-5056 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-5056 being exploited?

There is no known exploitation of CVE-2024-5056 in the wild and no public exploit code.

## Other vulnerabilities in Schneider Electric Modicon M340

- [CVE-2020-7536](https://insights.sbomify.com/CVE-2020-7536/): Denial of service in Modicon M340 CPUs (BMXP34* versions prior to V3.30) and Modicon M340 Communication Ethernet modules (BMXNOE0100 (H) versions prior to V3.4, BMXNOE0110 (H) versions prior to V6.6, and BMXNOR0200H all versions) (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-5056 and fix it if it is affected.

What it is: CVE-2024-5056 is a medium-severity vulnerability in Schneider Electric Modicon M340, published on 12 Jun 2024. 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-2024-5056 in the wild and no public exploit code.

Affected product: Schneider Electric Modicon M340. 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-2024-5056/ (Markdown: https://insights.sbomify.com/CVE-2024-5056/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-5056
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-5056
- OSV: https://osv.dev/vulnerability/CVE-2024-5056

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-5056/
Summaries are generated and may contain mistakes; the official description above is the record.