# CVE-2019-25658: a-Mac Address Change 5.4 Local Buffer Overflow DoS

> Local attackers can crash the application by pasting oversized data into registration form fields, causing a denial of service.

- **Severity:** Medium 6.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 5 Apr 2026
- **Updated:** 6 Apr 2026
- **Also known as:** GHSA-4fvm-5vr9-wq7p

## What is CVE-2019-25658?

CVE-2019-25658 is a medium-severity denial of service vulnerability in Amac Mac Address Change, published on 5 Apr 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

a-Mac Address Change 5.4 contains a local buffer overflow vulnerability that allows local attackers to crash the application by supplying oversized input to registration form fields. Attackers can paste 212 bytes of data into the 'Your Name', 'Your Company', or 'Register Code' fields and click the Register button to trigger a denial of service crash.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2019-25658?


## How do I fix CVE-2019-25658?

No fix has been published for CVE-2019-25658 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-25658 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25658 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-25658 and fix it if it is affected.

What it is: CVE-2019-25658 is a medium-severity denial of service vulnerability in Amac Mac Address Change, published on 5 Apr 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25658 exists.

Affected product: Amac Mac Address Change. 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-2019-25658/ (Markdown: https://insights.sbomify.com/CVE-2019-25658/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-25658
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-25658
- OSV: https://osv.dev/vulnerability/CVE-2019-25658

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-25658/
Summaries are generated and may contain mistakes; the official description above is the record.