# CVE-2022-3976: MZ Automation libiec61850 MMS File Services mms_client_files.c path traversal


- **Severity:** Medium 5.5 (`CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 13 Nov 2022
- **Updated:** 15 Apr 2025
- **Also known as:** GHSA-r8h4-q53x-8w2p

## What is CVE-2022-3976?

CVE-2022-3976 is a medium-severity vulnerability in MZ Automation libiec61850, published on 13 Nov 2022. 

### Official description

A vulnerability has been found in MZ Automation libiec61850 up to 1.4 and classified as critical. This vulnerability affects unknown code of the file src/mms/iso_mms/client/mms_client_files.c of the component MMS File Services. The manipulation of the argument filename leads to path traversal. Upgrading to version 1.5 is able to address this issue. The name of the patch is 10622ba36bb3910c151348f1569f039ecdd8786f. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-213556.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2022-3976?

It affects 1 product.


Products: Mz-Automation Libiec61850.

## How do I fix CVE-2022-3976?

No fix has been published for CVE-2022-3976 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-3976 being exploited?

There is no known exploitation of CVE-2022-3976 in the wild and no public exploit code.

## Other vulnerabilities in MZ Automation libiec61850

- [CVE-2022-2970](https://insights.sbomify.com/CVE-2022-2970/): MZ Automation libIEC61850 Stack-Based Buffer Overflow (critical 10.0)
- [CVE-2022-2972](https://insights.sbomify.com/CVE-2022-2972/): MZ Automation libIEC61850 Stack-Based Buffer Overflow (critical 10.0)
- [CVE-2024-45970](https://insights.sbomify.com/CVE-2024-45970/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-45971](https://insights.sbomify.com/CVE-2024-45971/): Memory corruption in n/a (critical 9.8)
- [CVE-2018-19185](https://insights.sbomify.com/CVE-2018-19185/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-3976 and fix it if it is affected.

What it is: CVE-2022-3976 is a medium-severity vulnerability in MZ Automation libiec61850, published on 13 Nov 2022. 
Exploitation: There is no known exploitation of CVE-2022-3976 in the wild and no public exploit code.

Affected product: MZ Automation libiec61850. 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-2022-3976/ (Markdown: https://insights.sbomify.com/CVE-2022-3976/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-3976
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-3976
- OSV: https://osv.dev/vulnerability/CVE-2022-3976

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-3976/
Summaries are generated and may contain mistakes; the official description above is the record.