# CVE-2025-2838: Silicon Labs Gecko OS DNS Response Processing Infinite Loop Denial-of-Service Vulnerability

> Network-adjacent attackers can cause a denial-of-service condition in Silicon Labs Gecko OS via an infinite loop in DNS response processing.

- **Severity:** Medium 6.5 (`CVSS:3.0/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:** 26 Mar 2025
- **Updated:** 27 Mar 2025
- **Also known as:** GHSA-2h59-fjvh-cg52

## What is CVE-2025-2838?

CVE-2025-2838 is a medium-severity denial of service vulnerability in Silicon Labs Gecko OS, published on 26 Mar 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Silicon Labs Gecko OS DNS Response Processing Infinite Loop Denial-of-Service Vulnerability. This vulnerability allows network-adjacent attackers to create a denial-of-service condition on affected installations of Silicon Labs Gecko OS. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the processing of DNS responses. The issue results from a logic error that can lead to an infinite loop. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-23392.

Weakness: CWE-835 (Loop with Unreachable Exit Condition)

## Which versions are affected by CVE-2025-2838?

It affects 1 product.


Products: Silabs Gecko Os.

## How do I fix CVE-2025-2838?

No fix has been published for CVE-2025-2838 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-2838 being exploited?

There is no known exploitation of CVE-2025-2838 in the wild and no public exploit code.

## Other vulnerabilities in Silicon Labs Gecko OS

- [CVE-2025-2837](https://insights.sbomify.com/CVE-2025-2837/): Silicon Labs Gecko OS HTTP Request Handling Stack-based Buffer Overflow Remote Code Execution Vulnerability (high 8.8)
- [CVE-2024-23973](https://insights.sbomify.com/CVE-2024-23973/): Silicon Labs Gecko OS HTTP GET Request Handling Stack-based Buffer Overflow (high 8.8)
- [CVE-2024-23938](https://insights.sbomify.com/CVE-2024-23938/): Silicon Labs Gecko OS Debug Interface Stack-based Buffer Overflow Remote Code Execution Vulnerability (high 8.8)
- [CVE-2024-24731](https://insights.sbomify.com/CVE-2024-24731/): Silicon Labs Gecko OS http_download Stack-based Buffer Overflow (high 7.5)
- [CVE-2024-23937](https://insights.sbomify.com/CVE-2024-23937/): Silicon Labs Gecko OS Debug Interface Format String (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-2838 and fix it if it is affected.

What it is: CVE-2025-2838 is a medium-severity denial of service vulnerability in Silicon Labs Gecko OS, published on 26 Mar 2025. 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-2025-2838 in the wild and no public exploit code.

Affected product: Silicon Labs Gecko OS. 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-2025-2838/ (Markdown: https://insights.sbomify.com/CVE-2025-2838/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-2838
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-2838
- OSV: https://osv.dev/vulnerability/CVE-2025-2838

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-2838/
Summaries are generated and may contain mistakes; the official description above is the record.