# CVE-2025-4236: PCMan FTP Server MDIR Command buffer overflow

> Remote attackers can exploit a buffer overflow in the MDIR command handler of PCMan FTP Server to execute arbitrary code or cause denial of service.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 May 2025
- **Updated:** 6 May 2025
- **Also known as:** GHSA-f2f6-hpmx-3wwh

## What is CVE-2025-4236?

CVE-2025-4236 is a medium-severity memory corruption vulnerability in Pcman Ftp Server, published on 3 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been found in PCMan FTP Server 2.0.7 and classified as critical. Affected by this vulnerability is an unknown functionality of the component MDIR Command Handler. The manipulation leads to buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2025-4236?

It affects 1 product.


Products: Pcman Ftp Server.

## How do I fix CVE-2025-4236?

No fix has been published for CVE-2025-4236 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-4236 being exploited?

There is no known exploitation of CVE-2025-4236 in the wild and no public exploit code.

## Other vulnerabilities in Pcman Ftp Server

- [CVE-2013-4730](https://insights.sbomify.com/CVE-2013-4730/): Memory corruption in n/a (critical 10.0)
- [CVE-2018-18861](https://insights.sbomify.com/CVE-2018-18861/): Memory corruption in n/a (critical 9.8)
- [CVE-2015-7601](https://insights.sbomify.com/CVE-2015-7601/): Path traversal in n/a (high 7.8)
- [CVE-2025-5634](https://insights.sbomify.com/CVE-2025-5634/): PCMan FTP Server NOOP Command buffer overflow (medium 6.9)
- [CVE-2025-5635](https://insights.sbomify.com/CVE-2025-5635/): PCMan FTP Server PLS Command buffer overflow (medium 6.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-4236 and fix it if it is affected.

What it is: CVE-2025-4236 is a medium-severity memory corruption vulnerability in Pcman Ftp Server, published on 3 May 2025. 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-2025-4236 in the wild and no public exploit code.

Affected product: Pcman Ftp Server. 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-2025-4236/ (Markdown: https://insights.sbomify.com/CVE-2025-4236/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-4236
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-4236
- OSV: https://osv.dev/vulnerability/CVE-2025-4236

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-4236/
Summaries are generated and may contain mistakes; the official description above is the record.