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CVE-2000-0573 — The lreply function in wu-ftpd 2.6.0 and earlier does not properly cleanse an untrusted…

Key facts

CVE-2000-0573 is a Critical (10.0) vulnerability: The lreply function in wu-ftpd 2.6.0 and earlier does not properly cleanse an untrusted…. This entry ships a detection-only PoC and a Docker test lab.
CVE CVE-2000-0573
Severity Critical (10.0)
Detection / prevention —
PoC poc.py
Source 2000/CVE-2000-0573/

Details

English | 한국어

Description

The lreply function in wu-ftpd 2.6.0 and earlier does not properly cleanse an untrusted format string, which allows remote attackers to execute arbitrary commands via the SITE EXEC command.

Vulnerability Details

Property Value
CVE ID CVE-2000-0573
CVSS Score 10.0

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2000/CVE-2000-0573/poc.py

Usage

# Run PoC against target
python3 poc.py --target <TARGET_URL>

# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>

⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.

Test Lab

This repository includes a Docker-based test environment with both vulnerable and patched applications.

Quick Start

# Clone and navigate to CVE directory
cd CVE-2000-0573

# Start both applications
docker-compose up -d

# Run tests
./run-tests.sh    # Linux/Mac
./run-tests.ps1   # Windows PowerShell

Application Endpoints

Application URL Status
Vulnerable App http://localhost:8080 Shows vulnerability
Patched App http://localhost:8081 Demonstrates fix

Directory Structure

├── README.md           # English documentation
├── README_KO.md        # Korean documentation
├── poc.py              # PoC detection script
├── docker-compose.yml  # Container orchestration
├── run-tests.sh        # Linux/Mac test runner
├── run-tests.ps1       # Windows test runner
├── vulnerable-app/     # Vulnerable version
│   ├── app.py
│   ├── Dockerfile
│   └── requirements.txt
└── patched-app/        # Fixed version
    ├── app.py
    ├── Dockerfile
    └── requirements.txt

References

  • ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-00:29.wu-ftpd.asc.v1.1
  • ftp://ftp.auscert.org.au/pub/auscert/advisory/AA-2000.02
  • ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2000-009.txt.asc
  • http://archives.neohapsis.com/archives/bugtraq/2000-06/0244.html
  • http://archives.neohapsis.com/archives/bugtraq/2000-07/0017.html
  • http://marc.info/?l=bugtraq&m=96171893218000&w=2
  • http://marc.info/?l=bugtraq&m=96179429114160&w=2
  • http://marc.info/?l=bugtraq&m=96299933720862&w=2
  • http://www.calderasystems.com/support/security/advisories/CSSA-2000-020.0.txt
  • http://www.cert.org/advisories/CA-2000-13.html
  • http://www.redhat.com/support/errata/RHSA-2000-039.html
  • http://www.securityfocus.com/bid/1387
  • http://www.securityfocus.com/templates/archive.pike?list=1&msg=20000623091822.3321.qmail%40fiver.freemessage.com
  • https://exchange.xforce.ibmcloud.com/vulnerabilities/4773
  • ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-00:29.wu-ftpd.asc.v1.1
  • ftp://ftp.auscert.org.au/pub/auscert/advisory/AA-2000.02
  • ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2000-009.txt.asc
  • http://archives.neohapsis.com/archives/bugtraq/2000-06/0244.html
  • http://archives.neohapsis.com/archives/bugtraq/2000-07/0017.html
  • http://marc.info/?l=bugtraq&m=96171893218000&w=2
  • http://marc.info/?l=bugtraq&m=96179429114160&w=2
  • http://marc.info/?l=bugtraq&m=96299933720862&w=2
  • http://www.calderasystems.com/support/security/advisories/CSSA-2000-020.0.txt
  • http://www.cert.org/advisories/CA-2000-13.html
  • http://www.redhat.com/support/errata/RHSA-2000-039.html
  • http://www.securityfocus.com/bid/1387
  • http://www.securityfocus.com/templates/archive.pike?list=1&msg=20000623091822.3321.qmail%40fiver.freemessage.com
  • https://exchange.xforce.ibmcloud.com/vulnerabilities/4773

Generated by PoC Generator on 2026-01-25T19:37:20.078679838

Frequently asked questions

What is CVE-2000-0573?

CVE-2000-0573 is a Critical (10.0) vulnerability: The lreply function in wu-ftpd 2.6.0 and earlier does not properly cleanse an untrusted…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2000-0573?

Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.

How do I block or mitigate CVE-2000-0573?

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

For authorized security testing and research only. See the full source and NVD record.