# CVE-2021-22716: Privilege escalation in C-Bus Toolkit

> An unprivileged user can modify a critical file to achieve remote code execution in Schneider Electric C-Bus Toolkit.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Apr 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-h57p-xqpc-6hj8

## What is CVE-2021-22716?

CVE-2021-22716 is a high-severity vulnerability in Schneider Electric C-Bus Toolkit, published on 13 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A CWE-732: Incorrect Permission Assignment for Critical Resource vulnerability exists that could allow remote code execution when an unprivileged user modifies a file. Affected Product: C-Bus Toolkit (V1.15.9 and prior)

Weakness: CWE-732 (Incorrect Permission Assignment for Critical Resource)

## Which versions are affected by CVE-2021-22716?

It affects 1 product.


Products: Schneider-Electric C-Bus Toolkit.

## How do I fix CVE-2021-22716?

No fix has been published for CVE-2021-22716 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-22716 being exploited?

There is no known exploitation of CVE-2021-22716 in the wild and no public exploit code.

## Other vulnerabilities in Schneider Electric C-Bus Toolkit

- [CVE-2023-5402](https://insights.sbomify.com/CVE-2023-5402/): Privilege escalation in C-Bus Toolkit (critical 9.8)
- [CVE-2021-22748](https://insights.sbomify.com/CVE-2021-22748/): Path traversal in C-Bus Toolkit (V1.15.9 and prior), C-Gate Server (V2.11.7 and prior) (high 8.8)
- [CVE-2021-22717](https://insights.sbomify.com/CVE-2021-22717/): Path traversal in C-Bus Toolkit V1.15.7 and prior (high 8.8)
- [CVE-2021-22719](https://insights.sbomify.com/CVE-2021-22719/): Path traversal in C-Bus Toolkit V1.15.7 and prior (high 8.8)
- [CVE-2021-22718](https://insights.sbomify.com/CVE-2021-22718/): Path traversal in C-Bus Toolkit V1.15.7 and prior (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22716 and fix it if it is affected.

What it is: CVE-2021-22716 is a high-severity vulnerability in Schneider Electric C-Bus Toolkit, published on 13 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-22716 in the wild and no public exploit code.

Affected product: Schneider Electric C-Bus Toolkit. 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-2021-22716/ (Markdown: https://insights.sbomify.com/CVE-2021-22716/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22716
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22716
- OSV: https://osv.dev/vulnerability/CVE-2021-22716

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-22716/
Summaries are generated and may contain mistakes; the official description above is the record.