# CVE-2023-51394: Potential DoS for EFR32xxx parts in high traffic environments due to null buffer dereference / crash

> High traffic can cause a crash in Silicon Labs Ember ZNet SDK due to a null pointer dereference, impacting device availability.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Feb 2024
- **Updated:** 16 Aug 2024
- **Also known as:** GHSA-fc74-wgp6-2pv9

## What is CVE-2023-51394?

CVE-2023-51394 is a medium-severity vulnerability in silabs.com Ember ZNet SDK, published on 23 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

High traffic environments may result in NULL Pointer Dereference vulnerability in Silicon Labs's Ember ZNet SDK before v7.4.0, causing a system crash.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2023-51394?

It affects 1 product.


Products: Silabs Emberznet.

## How do I fix CVE-2023-51394?

No fix has been published for CVE-2023-51394 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-51394 being exploited?

There is no known exploitation of CVE-2023-51394 in the wild and no public exploit code.

## Other vulnerabilities in silabs.com Ember ZNet SDK

- [CVE-2023-41094](https://insights.sbomify.com/CVE-2023-41094/): Touchlink authentication bypass due to packets processed after timeout or out of range in Ember ZNet (critical 10.0)
- [CVE-2026-85079](https://insights.sbomify.com/CVE-2026-85079/): Out-of-bounds write in Zigbee Simple_Desc_req handling (high 7.5)
- [CVE-2026-94502](https://insights.sbomify.com/CVE-2026-94502/): Out-of-bounds write in Zigbee Publish Price Matrix handling (high 7.5)
- [CVE-2026-4526](https://insights.sbomify.com/CVE-2026-4526/): Global ZCL command parser missing minimum-length validation in EmberZNet v9.0.2 (high 7.1)
- [CVE-2026-47145](https://insights.sbomify.com/CVE-2026-47145/): Color Control hue/saturation assertion abort in EmberZNet v9.0.2 (high 7.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-51394 and fix it if it is affected.

What it is: CVE-2023-51394 is a medium-severity vulnerability in silabs.com Ember ZNet SDK, published on 23 Feb 2024. 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-2023-51394 in the wild and no public exploit code.

Affected product: silabs.com Ember ZNet SDK. 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-2023-51394/ (Markdown: https://insights.sbomify.com/CVE-2023-51394/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-51394
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-51394
- OSV: https://osv.dev/vulnerability/CVE-2023-51394

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-51394/
Summaries are generated and may contain mistakes; the official description above is the record.