# CVE-2012-10055: ComSndFTP v1.3.7 Beta USER Format String RCE

> Remote attackers can achieve arbitrary code execution on ComSndFTP FTP Server via a format string vulnerability in the USER command, bypassing DEP protections.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Aug 2025
- **Updated:** 15 Jul 2026
- **Also known as:** GHSA-54qp-xm8v-h899

## What is CVE-2012-10055?

CVE-2012-10055 is a critical memory corruption vulnerability in ComSndFTP FTP Server, published on 13 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

ComSndFTP FTP Server version 1.3.7 Beta contains a format string vulnerability in its handling of the USER command. By sending a specially crafted username containing format specifiers, a remote attacker can overwrite a hardcoded function pointer in memory (specifically WSACleanup from Ws2_32.dll). This allows the attacker to redirect execution flow and bypass DEP protections using a ROP chain, ultimately leading to arbitrary code execution. The vulnerability is exploitable without authentication and affects default configurations.

Weakness: CWE-134 (Use of Externally-Controlled Format String)

## Which versions are affected by CVE-2012-10055?


## How do I fix CVE-2012-10055?

No fix has been published for CVE-2012-10055 yet. Limit exposure of the affected software until one is available.

## Is CVE-2012-10055 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2012-10055 exists.

Public exploit code:

- ComSndFTP v1.3.7 Beta USER Format String (Write4) Vulnerability (metasploit)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2012-10055 and fix it if it is affected.

What it is: CVE-2012-10055 is a critical memory corruption vulnerability in ComSndFTP FTP Server, published on 13 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2012-10055 exists.

Affected product: ComSndFTP 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-2012-10055/ (Markdown: https://insights.sbomify.com/CVE-2012-10055/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2012-10055
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2012-10055
- OSV: https://osv.dev/vulnerability/CVE-2012-10055

---
From sbomify Insights: https://insights.sbomify.com/CVE-2012-10055/
Summaries are generated and may contain mistakes; the official description above is the record.