# CVE-2021-33011: Denial of service in JTEKT Corporation TOYOPUC products

> Attackers can disrupt Ethernet communications between TOYOPUC industrial devices by sending ICMP flood packets, causing denial of service.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Sep 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-c4rx-vvj6-9gv8

## What is CVE-2021-33011?

CVE-2021-33011 is a medium-severity denial of service vulnerability in JTEKT Corporation TOYOPUC products, published on 10 Sep 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

All versions of the afffected TOYOPUC-PC10 Series,TOYOPUC-Plus Series,TOYOPUC-PC3J/PC2J Series, TOYOPUC-Nano Series products may not be able to properly process an ICMP flood, which may allow an attacker to deny Ethernet communications between affected devices.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2021-33011?

It affects 27 products.


Products: Jtekt 2port-Efr Thu-6404 Firmware, Jtekt Ef10 Tcu-6982 Firmware, Jtekt Fl\/Et-T-V2h Thu-6289 Firmware, Jtekt Nano 10gx Tuc-1157 Firmware, Jtekt Nano 2et Tuu-6949 Firmware, Jtekt Nano Cpu Tuc-6941 Firmware, Jtekt Nano Safety Rs00ip Tuu-1086 Firmware, Jtekt Nano Safety Rs01ip Tuu-1087 Firmware, Jtekt Nano Safety Tuc-1085 Firmware, Jtekt Pc10b-E\/C Tcu-6521 Firmware, Jtekt Pc10b-P Tcc-6373 Firmware, Jtekt Pc10b Tcc-1021 Firmware, Jtekt Pc10e Tcc-4637 Firmware, Jtekt Pc10g-Cpu Tcc-6353 Firmware, Jtekt Pc10ge Tcc-6464 Firmware, Jtekt Pc10p-Dp-Io Tcc-6752 Firmware, Jtekt Pc10p-Dp Tcc-6726 Firmware, Jtekt Pc10p Tcc-6372 Firmware, Jtekt Pc10pe-1616p Tcc-1102 Firmware, Jtekt Pc10pe Tcc-1101 Firmware and 7 more.

## How do I fix CVE-2021-33011?

No fix has been published for CVE-2021-33011 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-33011 being exploited?

There is no known exploitation of CVE-2021-33011 in the wild and no public exploit code.

## Other vulnerabilities in JTEKT Corporation TOYOPUC products

- [CVE-2021-27458](https://insights.sbomify.com/CVE-2021-27458/): Denial of service in JTEKT Corporation TOYOPUC products (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33011 and fix it if it is affected.

What it is: CVE-2021-33011 is a medium-severity denial of service vulnerability in JTEKT Corporation TOYOPUC products, published on 10 Sep 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-33011 in the wild and no public exploit code.

Affected product: JTEKT Corporation TOYOPUC products. 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-2021-33011/ (Markdown: https://insights.sbomify.com/CVE-2021-33011/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33011
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33011
- OSV: https://osv.dev/vulnerability/CVE-2021-33011

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-33011/
Summaries are generated and may contain mistakes; the official description above is the record.