# CVE-2022-34761: Null dereference in OPC UA Modicon Communication Module

> A null pointer dereference in Schneider Electric communication modules allows attackers to cause a denial of service by sending crafted JSON content.

- **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:** 13 Jul 2022
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-m9mx-49mx-whcc

## What is CVE-2022-34761?

CVE-2022-34761 is a high-severity vulnerability in Schneider Electric OPC UA Modicon Communication Module, published on 13 Jul 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A CWE-476: NULL Pointer Dereference vulnerability exists that could cause a denial of service of the webserver when parsing JSON content type. Affected Products: X80 advanced RTU Communication Module (BMENOR2200H) (V2.01 and later), OPC UA Modicon Communication Module (BMENUA0100) (V1.10 and prior)

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2022-34761?

It affects 2 products.


Products: Schneider-Electric Opc Ua Module for M580 Firmware, Schneider-Electric X80 Advanced Rtu Module Firmware.

## How do I fix CVE-2022-34761?

No fix has been published for CVE-2022-34761 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-34761 being exploited?

There is no known exploitation of CVE-2022-34761 in the wild and no public exploit code.

## Other vulnerabilities in Schneider Electric OPC UA Modicon Communication Module

- [CVE-2022-34759](https://insights.sbomify.com/CVE-2022-34759/): Memory corruption in OPC UA Modicon Communication Module (high 7.5)
- [CVE-2022-34760](https://insights.sbomify.com/CVE-2022-34760/): Denial of service in OPC UA Modicon Communication Module (high 7.5)
- [CVE-2022-34762](https://insights.sbomify.com/CVE-2022-34762/): Path traversal in OPC UA Modicon Communication Module (medium 5.9)
- [CVE-2022-34763](https://insights.sbomify.com/CVE-2022-34763/): Security feature bypass in OPC UA Modicon Communication Module (medium 5.9)
- [CVE-2022-34764](https://insights.sbomify.com/CVE-2022-34764/): Memory corruption in OPC UA Modicon Communication Module (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-34761 and fix it if it is affected.

What it is: CVE-2022-34761 is a high-severity vulnerability in Schneider Electric OPC UA Modicon Communication Module, published on 13 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-2022-34761 in the wild and no public exploit code.

Affected product: Schneider Electric OPC UA Modicon Communication Module. 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-2022-34761/ (Markdown: https://insights.sbomify.com/CVE-2022-34761/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-34761
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-34761
- OSV: https://osv.dev/vulnerability/CVE-2022-34761

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From sbomify Insights: https://insights.sbomify.com/CVE-2022-34761/
Summaries are generated and may contain mistakes; the official description above is the record.