# CVE-2004-1602: Information disclosure in n/a

> Remote attackers can enumerate valid usernames by timing ProFTPD server responses, facilitating targeted attacks.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:P/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Feb 2005
- **Updated:** 8 Aug 2024
- **Also known as:** GHSA-9qc2-2rhf-vf42

## What is CVE-2004-1602?

CVE-2004-1602 is a medium-severity vulnerability in n/a, published on 20 Feb 2005. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

ProFTPD 1.2.x, including 1.2.8 and 1.2.10, responds in a different amount of time when a given username exists, which allows remote attackers to identify valid usernames by timing the server response.

Weakness: CWE-203 (Observable Discrepancy)

## Which versions are affected by CVE-2004-1602?

It affects 1 product.


Products: Proftpd Proftpd.

## How do I fix CVE-2004-1602?

No fix has been published for CVE-2004-1602 yet. Limit exposure of the affected software until one is available.

## Is CVE-2004-1602 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2004-1602 exists.

Public exploit code:

- ProFTPd 1.2.10 - Remote Users Enumeration (exploitdb)
- ProFTPD 1.2.x - Username Enumeration via Timing Attack (nuclei)

## Other vulnerabilities in n/a

- [CVE-2010-4221](https://insights.sbomify.com/CVE-2010-4221/): Memory corruption in n/a (critical 10.0)
- [CVE-2010-20103](https://insights.sbomify.com/CVE-2010-20103/): ProFTPD 1.3.3c Backdoor Command Execution (critical 9.3)
- [CVE-2011-4130](https://insights.sbomify.com/CVE-2011-4130/): Use after free in n/a (critical 9.0)
- [CVE-2026-63090](https://insights.sbomify.com/CVE-2026-63090/): ProFTPD mod_sftp Heap Buffer Overflow via SFTP Packet Reassembly (high 8.7)
- [CVE-2026-35025](https://insights.sbomify.com/CVE-2026-35025/): ProFTPD ACL Bypass via /proc/self/root Path Prefix in RNFR (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2004-1602 and fix it if it is affected.

What it is: CVE-2004-1602 is a medium-severity vulnerability in n/a, published on 20 Feb 2005. 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-2004-1602 exists.

Affected product: n/a. 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-2004-1602/ (Markdown: https://insights.sbomify.com/CVE-2004-1602/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2004-1602
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2004-1602
- OSV: https://osv.dev/vulnerability/CVE-2004-1602

---
From sbomify Insights: https://insights.sbomify.com/CVE-2004-1602/
Summaries are generated and may contain mistakes; the official description above is the record.