# CVE-2020-7524: Memory corruption in Modicon M218 Logic Controller V5.0.0.7 and prior

> An attacker can cause a denial of service on Schneider Electric Modicon M218 Logic Controllers by sending a crafted IPv4 packet, requiring a power cycle to recover.

- **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:** 31 Aug 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-v479-fx8q-4c3m

## What is CVE-2020-7524?

CVE-2020-7524 is a high-severity memory corruption vulnerability in Modicon M218 Logic Controller V5.0.0.7 and prior, published on 31 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Out-of-bounds Write vulnerability exists in Modicon M218 Logic Controller (V5.0.0.7 and prior) which could cause Denial of Service when sending specific crafted IPV4 packet to the controller: Sending a specific IPv4 protocol package to Schneider Electric Modicon M218 Logic Controller can cause IPv4 devices to go down. The device does not work properly and must be powered back on to return to normal.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2020-7524?

It affects 1 product.


Products: Schneider-Electric Modicon M218 Firmware.

## How do I fix CVE-2020-7524?

No fix has been published for CVE-2020-7524 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-7524 being exploited?

There is no known exploitation of CVE-2020-7524 in the wild and no public exploit code.

## Other vulnerabilities in Modicon M218 Logic Controller V5.0.0.7 and prior

- [CVE-2021-22800](https://insights.sbomify.com/CVE-2021-22800/): Denial of service in Modicon M218 Logic Controller (V5.1.0.6 and prior) (high 7.5)
- [CVE-2020-7502](https://insights.sbomify.com/CVE-2020-7502/): Memory corruption in Modicon M218 Logic Controller (Firmware version 4.3 and prior) (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-7524 and fix it if it is affected.

What it is: CVE-2020-7524 is a high-severity memory corruption vulnerability in Modicon M218 Logic Controller V5.0.0.7 and prior, published on 31 Aug 2020. 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-2020-7524 in the wild and no public exploit code.

Affected product: Modicon M218 Logic Controller V5.0.0.7 and prior. 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-2020-7524/ (Markdown: https://insights.sbomify.com/CVE-2020-7524/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-7524
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-7524
- OSV: https://osv.dev/vulnerability/CVE-2020-7524

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-7524/
Summaries are generated and may contain mistakes; the official description above is the record.