# CVE-2000-1221: Auth bypass in n/a

> Remote attackers can bypass lpd access controls by manipulating DNS reverse resolution to spoof the local hostname, allowing unauthorized print job submission.

- **Severity:** Critical 10.0 (`AV:N/AC:L/Au:N/C:C/I:C/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 21 Apr 2005
- **Updated:** 8 Aug 2024
- **Also known as:** DEBIAN-CVE-2000-1221, GHSA-7g6p-865f-j3r5

## What is CVE-2000-1221?

CVE-2000-1221 is a critical authentication bypass vulnerability in Debian Debian Linux, published on 21 Apr 2005. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The line printer daemon (lpd) in the lpr package in multiple Linux operating systems authenticates by comparing the reverse-resolved hostname of the local machine to the hostname of the print server as returned by gethostname, which allows remote attackers to bypass intended access controls by modifying the DNS for the attacking IP.

## Which versions are affected by CVE-2000-1221?

It affects 3 products.


Products: Debian Debian Linux, Redhat Linux, Sgi Irix.

## How do I fix CVE-2000-1221?

Apply the vendor's patch.

## Is CVE-2000-1221 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2000-1221 exists.

Public exploit code:

- RedHat 6.1 / IRIX 6.5.18 - 'lpd' Command Execution (exploitdb)

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2000-1221 and fix it if it is affected.

What it is: CVE-2000-1221 is a critical authentication bypass vulnerability in Debian Debian Linux, published on 21 Apr 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-2000-1221 exists.

Affected product: Debian Debian Linux. 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-2000-1221/ (Markdown: https://insights.sbomify.com/CVE-2000-1221/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2000-1221
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2000-1221
- OSV: https://osv.dev/vulnerability/CVE-2000-1221

---
From sbomify Insights: https://insights.sbomify.com/CVE-2000-1221/
Summaries are generated and may contain mistakes; the official description above is the record.