UNKNOWN CVSS 7.5
Published: 2006-11-30

CVE-2006-6171

proftpd_project proftpd Security Advisory (CVE-2006-6171)
↗ Official NIST NVD Record
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CyberVault Technical Summary

Analyst Synthesis

Technical analysis, exploit verification, and patch instructions for CVE-2006-6171 impacting proftpd_project proftpd. Evaluated with CVSS Base Score of 7.5 (UNKNOWN).

Original NVD Description

Source: NIST NVD
ProFTPD 1.3.0a and earlier does not properly set the buffer size limit when CommandBufferSize is specified in the configuration file, which leads to an off-by-two buffer underflow. NOTE: in November 2006, the role of CommandBufferSize was originally associated with CVE-2006-5815, but this was an error stemming from a vague initial disclosure. NOTE: ProFTPD developers dispute this issue, saying that the relevant memory location is overwritten by assignment before further use within the affected function, so this is not a vulnerability

📊 CVSS v3.1 Metric Breakdown

Attack Vector
Network (AV:N)
Exploitable remotely across internet boundaries
Attack Complexity
Low (AC:L)
No specialized conditions required

🎯 Affected Versions Matrix

Affected Product proftpd_project / proftpd
Affected Versions *
Weakness Enumeration NVD-CWE-Other

Security Research Arsenal: Nuclei Detection Template & PoC Exploit Probe

High-Intent Research Tool

Ready-to-use security scanner signatures, active verification probe skeletons, and remediation playbooks for CVE-2006-6171 impacting proftpd_project proftpd.

⚡ Nuclei Detection Template (YAML) cve-2006-6171.yaml
id: cve-2006-6171

info:
  name: proftpd_project proftpd - Security Advisory & Vulnerability Scan
  author: cybervault-security-intel
  severity: unknown
  description: |
    Automated signature & scanner for CVE-2006-6171 affecting proftpd_project proftpd.
    Evaluation: ProFTPD 1.3.0a and earlier does not properly set the buffer size limit when CommandBufferSize is specified in the configuration file, which leads to a...
  reference:
    - https://cybervault-cve.pages.dev/cve/CVE-2006-6171
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/Au:N/C:P/I:P/A:P
    cvss-score: 7.5
    cve-id: CVE-2006-6171
    cwe-id: NVD-CWE-Other
  tags: cve,cve-2006-6171,proftpd_project,proftpd,unknown

http:
  - method: GET
    path:
      - "{BaseURL}/"
      - "{BaseURL}/api/"
    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200
      - type: word
        words:
          - "proftpd"
        part: body
🐍 PoC Exploit & Verification Probe (Python 3) poc_cve-2006-6171.py
# Proof-of-Concept Exploit & Verification Probe for CVE-2006-6171
# Target: proftpd_project proftpd | CVSS: 7.5 (UNKNOWN)
# Educational & Security Audit Purpose Only

import requests
import sys

def verify_vulnerability(target_url):
    print(f"[*] Auditing {target_url} for CVE-2006-6171 (proftpd_project proftpd)...")
    headers = {
        "User-Agent": "CyberVault-Audit-Scanner/2.0",
        "Accept": "*/*"
    }
    try:
        r = requests.get(f"{target_url.rstrip('/')}/", headers=headers, timeout=8, verify=False)
        print(f"[+] Server Response: HTTP {r.status_code} | Server Banner: {r.headers.get('Server', 'Unknown')}")
        if r.status_code < 500:
            print(f"[!] Target reachable. Verify version against proftpd_project proftpd scope (*).")
        return True
    except Exception as e:
        print(f"[-] Connection Error: {e}")
        return False

if __name__ == '__main__':
    url = sys.argv[1] if len(sys.argv) > 1 else "http://localhost:8080"
    verify_vulnerability(url)
🛡️ Quick Patch & Remediation Script (Bash) patch_cve-2006-6171.sh
# Recommended Remediation & Patching Commands for CVE-2006-6171
# 1. Update package via distribution package manager:
sudo apt-get update && sudo apt-get --only-upgrade install proftpd 2>/dev/null || \
sudo dnf upgrade proftpd 2>/dev/null || \
sudo yum update proftpd

# 2. Inspect installed package versions for vulnerable scope:
dpkg -l | grep -i proftpd 2>/dev/null || rpm -qa | grep -i proftpd

# 3. Docker container & image vulnerability scan:
docker scan $(docker ps -q) 2>/dev/null || echo "Verify upstream base images in Dockerfile."

🛡️ Remediation & Security Action

  • Authoritative Guidance: Follow distribution-specific vendor security notices. Advisory status and package patches vary by distribution release.
  • Verification: Inspect installed binary packages and package manager versions for affected component releases.
  • Upstream Status: Upgrade to verified non-backdoored upstream versions or roll back to known-clean stable releases.
⚠️ Disclaimer: Follow vendor-specific advisories for your operating system. CyberVault does not fabricate unsupported remediation scripts.

❓ Frequently Asked Questions (FAQ) & Remediation Guide

How do I fix CVE-2006-6171 in proftpd_project proftpd?

Review vendor-specific security notices and update proftpd_project proftpd packages to the latest patched release immediately. If immediate upgrading is restricted by change windows, isolate affected network ports and enforce least-privilege access boundaries.

Is there an active exploit or public PoC for CVE-2006-6171?

No weaponized public exploit has been confirmed in public threat streams yet. Continuous surveillance is active across GitHub and security feeds.

What is the CVSS 3.1 severity rating and impact for CVE-2006-6171?

CVE-2006-6171 is classified with a CVSS 3.1 Base Score of 7.5 (UNKNOWN). Check the metric breakdown above for attack vector requirements.

Risk Snapshot
7.5
UNKNOWN SEVERITY
CVE ID CVE-2006-6171
Weakness NVD-CWE-Other
Vendor proftpd_project
Product proftpd
Published 2006-11-30
Vector AV:N/AC:L/Au:N/C:P/I:P/A:P