# CVE-2001-0843: Denial of service in n/a

> Remote attackers can crash the Squid proxy server by sending a specific FTP PUT request, causing a denial of service.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Mar 2002
- **Updated:** 8 Aug 2024
- **Also known as:** GHSA-3jpq-2j9m-x6ww

## What is CVE-2001-0843?

CVE-2001-0843 is a medium-severity denial of service vulnerability in n/a, published on 9 Mar 2002. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Squid proxy server 2.4 and earlier allows remote attackers to cause a denial of service (crash) via a mkdir-only FTP PUT request.

## Which versions are affected by CVE-2001-0843?

It affects 1 product.


Products: Squid Squid Web Proxy.

## How do I fix CVE-2001-0843?

No fix has been published for CVE-2001-0843 yet. Limit exposure of the affected software until one is available.

## Is CVE-2001-0843 being exploited?

There is no known exploitation of CVE-2001-0843 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2001-0843 and fix it if it is affected.

What it is: CVE-2001-0843 is a medium-severity denial of service vulnerability in n/a, published on 9 Mar 2002. 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-2001-0843 in the wild and no public exploit code.

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-2001-0843/ (Markdown: https://insights.sbomify.com/CVE-2001-0843/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2001-0843
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2001-0843
- OSV: https://osv.dev/vulnerability/CVE-2001-0843

---
From sbomify Insights: https://insights.sbomify.com/CVE-2001-0843/
Summaries are generated and may contain mistakes; the official description above is the record.