# CVE-2024-33687: Security feature bypass in NJ Series CPU Unit

> Attackers can alter user programs on OMRON NJ and NX CPU Units without detection due to insufficient data authenticity verification.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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:** 24 Jun 2024
- **Updated:** 13 Mar 2025
- **Also known as:** GHSA-9vq2-24jp-74ch

## What is CVE-2024-33687?

CVE-2024-33687 is a high-severity vulnerability in OMRON Corporation NJ Series CPU Unit, published on 24 Jun 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Insufficient verification of data authenticity issue exists in NJ Series CPU Unit all versions and NX Series CPU Unit all versions. If a user program in the affected product is altered, the product may not be able to detect the alteration.

Weakness: CWE-345 (Insufficient Verification of Data Authenticity)

## Which versions are affected by CVE-2024-33687?

It affects 55 products.


Products: Omron Nj-Pa3001 Firmware, Omron Nj-Pd3001 Firmware, Omron Nj101-1000 Firmware, Omron Nj101-1020 Firmware, Omron Nj101-9000 Firmware, Omron Nj101-9020 Firmware, Omron Nj301-1100 Firmware, Omron Nj301-1200 Firmware, Omron Nj501-1300 Firmware, Omron Nj501-1320 Firmware, Omron Nj501-1340 Firmware, Omron Nj501-1400 Firmware, Omron Nj501-140 Firmware, Omron Nj501-1420 Firmware, Omron Nj501-1500 Firmware, Omron Nj501-1520 Firmware, Omron Nj501-4300 Firmware, Omron Nj501-4310 Firmware, Omron Nj501-4320 Firmware, Omron Nj501-4400 Firmware and 35 more.

## How do I fix CVE-2024-33687?

No fix has been published for CVE-2024-33687 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-33687 being exploited?

There is no known exploitation of CVE-2024-33687 in the wild and no public exploit code.

## Other vulnerabilities in OMRON Corporation NJ Series CPU Unit

- [CVE-2022-33971](https://insights.sbomify.com/CVE-2022-33971/): Auth bypass in Machine automation controller NJ series, Machine automation controller NX series, Automation software 'Sysmac Studio', and Programmable Terminal (PT) NA series (high 8.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-33687 and fix it if it is affected.

What it is: CVE-2024-33687 is a high-severity vulnerability in OMRON Corporation NJ Series CPU Unit, published on 24 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-2024-33687 in the wild and no public exploit code.

Affected product: OMRON Corporation NJ Series CPU Unit. 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-2024-33687/ (Markdown: https://insights.sbomify.com/CVE-2024-33687/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-33687
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-33687
- OSV: https://osv.dev/vulnerability/CVE-2024-33687

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-33687/
Summaries are generated and may contain mistakes; the official description above is the record.