# CVE-2018-25304: Free Download Manager 2.0 Build 417 Local Buffer Overflow SEH

> Attackers can execute arbitrary code by tricking users into importing a malicious URL file, causing a buffer overflow in Free Download Manager.

- **Severity:** High 8.6 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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:** Not needed
- **Fix available:** No
- **Published:** 29 Apr 2026
- **Updated:** 26 May 2026
- **Also known as:** GHSA-cm7p-95v3-q34h

## What is CVE-2018-25304?

CVE-2018-25304 is a high-severity memory corruption vulnerability in Filehippo Free Download Manager, published on 29 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Free Download Manager 2.0 Build 417 contains a local buffer overflow vulnerability in the URL import functionality that allows attackers to trigger a structured exception handler (SEH) chain exploitation. Attackers can craft a malicious URL file that, when imported through the File > Import > Import lists of downloads menu, causes a buffer overflow in the Location header response that overwrites the SEH chain and executes arbitrary code.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2018-25304?


## How do I fix CVE-2018-25304?

No fix has been published for CVE-2018-25304 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-25304 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-25304 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-25304 and fix it if it is affected.

What it is: CVE-2018-25304 is a high-severity memory corruption vulnerability in Filehippo Free Download Manager, published on 29 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-25304 exists.

Affected product: Filehippo Free Download Manager. 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-2018-25304/ (Markdown: https://insights.sbomify.com/CVE-2018-25304/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-25304
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-25304
- OSV: https://osv.dev/vulnerability/CVE-2018-25304

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-25304/
Summaries are generated and may contain mistakes; the official description above is the record.