# CVE-2020-7486: Denial of service in Tricon TCM Model 4351, 4352, 4351A/B, 4352A/B (v10.3.x, v10.4.x)

> High network load causes Tricon TCM modules to reset, leading to denial of service in industrial control systems.

- **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 Apr 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-vxcj-679q-r6q8

## What is CVE-2020-7486?

CVE-2020-7486 is a high-severity denial of service vulnerability in Tricon TCM Model 4351, 4352, 4351A/B, 4352A/B (v10.3.x, v10.4.x), published on 15 Apr 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

**VERSION NOT SUPPORTED WHEN ASSIGNED** A vulnerability could cause TCM modules to reset when under high network load in TCM v10.4.x and in system v10.3.x. This vulnerability was discovered and remediated in version v10.5.x on August 13, 2009. TCMs from v10.5.x and on will no longer exhibit this behavior.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2020-7486?

It affects 6 products.


Products: Schneider-Electric Tricon Tcm 4351 Firmware, Schneider-Electric Tricon Tcm 4351a Firmware, Schneider-Electric Tricon Tcm 4351b Firmware, Schneider-Electric Tricon Tcm 4352 Firmware, Schneider-Electric Tricon Tcm 4352a Firmware, Schneider-Electric Tricon Tcm 4352b Firmware.

## How do I fix CVE-2020-7486?

No fix has been published for CVE-2020-7486 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-7486 being exploited?

There is no known exploitation of CVE-2020-7486 in the wild and no public exploit code.

## Other vulnerabilities in Tricon TCM Model 4351, 4352, 4351A/B, 4352A/B (v10.3.x, v10.4.x)

- [CVE-2020-7491](https://insights.sbomify.com/CVE-2020-7491/): **VERSION NOT SUPPORTED WHEN ASSIGNED** A legacy debug port account in TCMs installed in Tricon system versions 10.2.0 through 10.5.3 is vis (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-7486 and fix it if it is affected.

What it is: CVE-2020-7486 is a high-severity denial of service vulnerability in Tricon TCM Model 4351, 4352, 4351A/B, 4352A/B (v10.3.x, v10.4.x), published on 15 Apr 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-2020-7486 in the wild and no public exploit code.

Affected product: Tricon TCM Model 4351, 4352, 4351A/B, 4352A/B (v10.3.x, v10.4.x). 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-2020-7486/ (Markdown: https://insights.sbomify.com/CVE-2020-7486/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-7486
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-7486
- OSV: https://osv.dev/vulnerability/CVE-2020-7486

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-7486/
Summaries are generated and may contain mistakes; the official description above is the record.