# CVE-2022-31206: Missing authorization in n/a

> Attackers can inject arbitrary machine code into Omron SYSMAC PLCs due to lack of cryptographic authentication on downloaded logic, enabling remote code execution.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 26 Jul 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-fw2j-wpp5-8vp5

## What is CVE-2022-31206?

CVE-2022-31206 is a critical missing authorization vulnerability in n/a, published on 26 Jul 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Omron SYSMAC Nx product family PLCs (NJ series, NY series, NX series, and PMAC series) through 2022-005-18 lack cryptographic authentication. These PLCs are programmed using the SYMAC Studio engineering software (which compiles IEC 61131-3 conformant POU code to native machine code for execution by the PLC's runtime). The resulting machine code is executed by a runtime, typically controlled by a real-time operating system. The logic that is downloaded to the PLC does not seem to be cryptographically authenticated, allowing an attacker to manipulate transmitted object code to the PLC and execute arbitrary machine code on the processor of the PLC's CPU module in the context of the runtime. In the case of at least the NJ series, an RTOS and hardware combination is used that would potentially allow for memory protection and privilege separation and thus limit the impact of code execution. However, it was not confirmed whether these sufficiently segment the runtime from the rest of the RTOS.

Weakness: CWE-347 (Improper Verification of Cryptographic Signature)

## Which versions are affected by CVE-2022-31206?

It affects 25 products.


Products: 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 Nj501-1420 Firmware, Omron Nj501-1500 Firmware, Omron Nj501-1520 Firmware, Omron Nj501-4300 Firmware, Omron Nj501-4320 Firmware, Omron Nj501-4400 Firmware, Omron Nj501-4500 Firmware, Omron Nj501-5300-1 Firmware, Omron Nj501-5300 Firmware, Omron Nx701-1600 Firmware and 5 more.

## How do I fix CVE-2022-31206?

No fix has been published for CVE-2022-31206 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-31206 being exploited?

There is no known exploitation of CVE-2022-31206 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-31206 and fix it if it is affected.

What it is: CVE-2022-31206 is a critical missing authorization vulnerability in n/a, published on 26 Jul 2022. 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-2022-31206 in the wild and no public exploit code.

Affected product: n/a. 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-2022-31206/ (Markdown: https://insights.sbomify.com/CVE-2022-31206/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-31206
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-31206
- OSV: https://osv.dev/vulnerability/CVE-2022-31206

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-31206/
Summaries are generated and may contain mistakes; the official description above is the record.