# CVE-2022-45794: Omron CJ-series and CS-series unauthenticated filesystem access.

> An attacker with network access can read and write files on Omron CJ and CS-series PLCs without authentication.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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:** 10 Jan 2024
- **Updated:** 22 May 2025
- **Also known as:** GHSA-j4xh-qhcf-rpxf

## What is CVE-2022-45794?

CVE-2022-45794 is a high-severity missing authorization vulnerability in Omron CJ-series and CS-series CPU modules, published on 10 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An attacker with network access to the affected PLC (CJ-series and CS-series PLCs, all versions) may use a network protocol to read and write files on the PLC internal memory and memory card.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2022-45794?

It affects 41 products.


Products: Omron Sysmac Cj1g-Cpu42p Firmware, Omron Sysmac Cj1g-Cpu43p Firmware, Omron Sysmac Cj1g-Cpu44p Firmware, Omron Sysmac Cj1g-Cpu45p Firmware, Omron Sysmac Cj2h-Cpu64-Eip Firmware, Omron Sysmac Cj2h-Cpu64 Firmware, Omron Sysmac Cj2h-Cpu65-Eip Firmware, Omron Sysmac Cj2h-Cpu65 Firmware, Omron Sysmac Cj2h-Cpu66-Eip Firmware, Omron Sysmac Cj2h-Cpu66 Firmware, Omron Sysmac Cj2h-Cpu67-Eip Firmware, Omron Sysmac Cj2h-Cpu67 Firmware, Omron Sysmac Cj2h-Cpu68-Eip Firmware, Omron Sysmac Cj2h-Cpu68 Firmware, Omron Sysmac Cj2m-Cpu11 Firmware, Omron Sysmac Cj2m-Cpu12 Firmware, Omron Sysmac Cj2m-Cpu13 Firmware, Omron Sysmac Cj2m-Cpu14 Firmware, Omron Sysmac Cj2m-Cpu15 Firmware, Omron Sysmac Cj2m-Cpu31 Firmware and 21 more.

## How do I fix CVE-2022-45794?

No fix has been published for CVE-2022-45794 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-45794 being exploited?

There is no known exploitation of CVE-2022-45794 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-45794 and fix it if it is affected.

What it is: CVE-2022-45794 is a high-severity missing authorization vulnerability in Omron CJ-series and CS-series CPU modules, published on 10 Jan 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-2022-45794 in the wild and no public exploit code.

Affected product: Omron CJ-series and CS-series CPU modules. 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-2022-45794/ (Markdown: https://insights.sbomify.com/CVE-2022-45794/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-45794
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-45794
- OSV: https://osv.dev/vulnerability/CVE-2022-45794

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From sbomify Insights: https://insights.sbomify.com/CVE-2022-45794/
Summaries are generated and may contain mistakes; the official description above is the record.