# CVE-2023-6533: Silicon Labs PC Controller Denial of Service Vulnerability

> Attackers can cause denial of service in Silicon Labs PC Controller by sending malformed packets, preventing device acknowledgments.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Feb 2024
- **Updated:** 27 Sep 2024
- **Also known as:** GHSA-c467-vf3v-2g2q

## What is CVE-2023-6533?

CVE-2023-6533 is a medium-severity denial of service vulnerability in silabs.com PC Controller, published on 21 Feb 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Malformed Device Reset Locally Command Class packets can be sent to the controller, causing the controller to assume the end device has left the network. After this, frames sent by the end device will not be acknowledged by the controller. This vulnerability exists in PC Controller v5.54.0, and earlier.

Weakness: CWE-419 (Unprotected Primary Channel), CWE-248 (Uncaught Exception)

## Which versions are affected by CVE-2023-6533?

It affects 1 product.


Products: Silabs Z-Wave Pc-Based Controller.

## How do I fix CVE-2023-6533?

No fix has been published for CVE-2023-6533 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-6533 being exploited?

There is no known exploitation of CVE-2023-6533 in the wild and no public exploit code.

## Other vulnerabilities in silabs.com PC Controller

- [CVE-2023-6640](https://insights.sbomify.com/CVE-2023-6640/): Silicon Labs PC Controller v5.54.0 and Earlier Denial of Service Vulnerability (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-6533 and fix it if it is affected.

What it is: CVE-2023-6533 is a medium-severity denial of service vulnerability in silabs.com PC Controller, published on 21 Feb 2024. 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-2023-6533 in the wild and no public exploit code.

Affected product: silabs.com PC Controller. 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-2023-6533/ (Markdown: https://insights.sbomify.com/CVE-2023-6533/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-6533
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-6533
- OSV: https://osv.dev/vulnerability/CVE-2023-6533

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-6533/
Summaries are generated and may contain mistakes; the official description above is the record.