# CVE-2019-6845: Information disclosure in Modicon M580, Modicon M340, Modicon Premium , Modicon Quantum (all firmware versions)

> Attackers can intercept sensitive information during application transfers to Modicon PLCs via Modbus TCP due to cleartext transmission.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Oct 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-m7mw-4chh-hqmq

## What is CVE-2019-6845?

CVE-2019-6845 is a high-severity vulnerability in Modicon M580, Modicon M340, Modicon Premium , Modicon Quantum (all firmware versions), published on 29 Oct 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A CWE-319: Cleartext Transmission of Sensitive Information vulnerability exists in Modicon M580, Modicon M340, Modicon Premium , Modicon Quantum (all firmware versions), which could cause the disclosure of information when transferring applications to the controller using Modbus TCP protocol.

Weakness: CWE-319 (Cleartext Transmission of Sensitive Information)

## Which versions are affected by CVE-2019-6845?

It affects 23 products.


Products: Schneider-Electric Modicon M340 Firmware, Schneider-Electric Modicon M580 Firmware, Schneider-Electric Tsxmcpc002m Firmware, Schneider-Electric Tsxmcpc512k Firmware, Schneider-Electric Tsxmfp0128p2 Firmware, Schneider-Electric Tsxmfp064p2 Firmware, Schneider-Electric Tsxmfpp001m Firmware, Schneider-Electric Tsxmfpp002m Firmware, Schneider-Electric Tsxmfpp004m Firmware, Schneider-Electric Tsxmfpp224k Firmware, Schneider-Electric Tsxmfpp384k Firmware, Schneider-Electric Tsxmfpp512k Firmware, Schneider-Electric Tsxmrpc001m Firmware, Schneider-Electric Tsxmrpc002m Firmware, Schneider-Electric Tsxmrpc003m Firmware, Schneider-Electric Tsxmrpc007m Firmware, Schneider-Electric Tsxmrpc01m7 Firmware, Schneider-Electric Tsxmrpc448k Firmware, Schneider-Electric Tsxmrpc768k Firmware, Schneider-Electric Tsxmrpf004m Firmware and 3 more.

## How do I fix CVE-2019-6845?

No fix has been published for CVE-2019-6845 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-6845 being exploited?

There is no known exploitation of CVE-2019-6845 in the wild and no public exploit code.

## Other vulnerabilities in Modicon M580, Modicon M340, Modicon Premium , Modicon Quantum (all firmware versions)

- [CVE-2018-7842](https://insights.sbomify.com/CVE-2018-7842/): Auth bypass in Modicon M580 Modicon M340 Modicon Quantum Modicon Premium (critical 9.8)
- [CVE-2018-7846](https://insights.sbomify.com/CVE-2018-7846/): Auth bypass in Modicon M580 Modicon M340 Modicon Quantum Modicon Premium (critical 9.8)
- [CVE-2018-7847](https://insights.sbomify.com/CVE-2018-7847/): Missing authorization in Modicon M580 Modicon M340 Modicon Quantum Modicon Premium (critical 9.8)
- [CVE-2019-6808](https://insights.sbomify.com/CVE-2019-6808/): Missing authorization in Modicon M580 Modicon M340 Modicon Quantum Modicon Premium (critical 9.8)
- [CVE-2019-6851](https://insights.sbomify.com/CVE-2019-6851/): Information disclosure in Modicon M580, Modicon M340, Modicon Premium , Modicon Quantum (all firmware versions) (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-6845 and fix it if it is affected.

What it is: CVE-2019-6845 is a high-severity vulnerability in Modicon M580, Modicon M340, Modicon Premium , Modicon Quantum (all firmware versions), published on 29 Oct 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-2019-6845 in the wild and no public exploit code.

Affected product: Modicon M580, Modicon M340, Modicon Premium , Modicon Quantum (all firmware versions). 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-2019-6845/ (Markdown: https://insights.sbomify.com/CVE-2019-6845/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-6845
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-6845
- OSV: https://osv.dev/vulnerability/CVE-2019-6845

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-6845/
Summaries are generated and may contain mistakes; the official description above is the record.