10.0
HIGH CVSS 2.0
CVE-2011-2523
Vsftpd Backdoor Shell Access
Description

vsftpd 2.3.4 downloaded between 20110630 and 20110703 contains a backdoor which opens a shell on port 6200/tcp.

INFO

Published Date :

Nov. 27, 2019, 9:15 p.m.

Last Modified :

Nov. 21, 2024, 1:28 a.m.

Remotely Exploit :

Yes !
Affected Products

The following products are affected by CVE-2011-2523 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Debian debian_linux
1 Vsftpd_project vsftpd
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 HIGH [email protected]
CVSS 3.1 CRITICAL [email protected]
Public PoC/Exploit Available at Github

CVE-2011-2523 has a 256 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2011-2523 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

his project demonstrates the exploitation of the vsFTPd 2.3.4 backdoor vulnerability (CVE-2011-2523) using Metasploitable 2 and Kali Linux with Metasploit. It includes reconnaissance, exploitation, and defensive measures, with a detailed report and lab setup for learning ethical hacking and security best practices.

Updated: 2 days, 13 hours ago
0 stars 0 fork 0 watcher
Born at : Aug. 25, 2025, 2:13 a.m. This repo has been linked 1 different CVEs too.

None

Updated: 4 days, 14 hours ago
0 stars 0 fork 0 watcher
Born at : Aug. 23, 2025, 1:04 a.m. This repo has been linked 3 different CVEs too.

This project is a full-scope penetration test on Saint Nicholas Hospital’s digital infrastructure. It covers reconnaissance, vulnerability assessment, exploitation, and risk analysis—highlighting real-world threats to patient data and operations, with remediation strategies for healthcare security.

Updated: 6 days, 7 hours ago
0 stars 0 fork 0 watcher
Born at : Aug. 21, 2025, 8:44 a.m. This repo has been linked 2 different CVEs too.

A step-by-step walkthrough of exploiting the vsFTPd 2.3.4 backdoor vulnerability (CVE-2011-2523) in a controlled lab environment, demonstrating reconnaissance, exploitation with Metasploit, and establishing a reverse shell.

Updated: 1 week ago
0 stars 0 fork 0 watcher
Born at : Aug. 20, 2025, 9:54 a.m. This repo has been linked 1 different CVEs too.

Penetration Testing and Vulerability Assessment

Updated: 5 days, 8 hours ago
0 stars 0 fork 0 watcher
Born at : Aug. 19, 2025, 3:15 p.m. This repo has been linked 1 different CVEs too.

None

Updated: 1 week, 1 day ago
0 stars 0 fork 0 watcher
Born at : Aug. 18, 2025, 6:38 p.m. This repo has been linked 2 different CVEs too.

None

Updated: 4 days, 22 hours ago
1 stars 1 fork 1 watcher
Born at : Aug. 18, 2025, 4:23 p.m. This repo has been linked 2 different CVEs too.

[GRATIS] La Biblia Negrísima del Ethical Hacker: un viaje profundo al Red Team, con técnicas de hacking ético, OSINT, Nmap, Metasploit, evasión, ingeniería social y ataques avanzados. Pensar como atacante para defender como maestro.

ethical-hacking hacking

Updated: 3 days, 6 hours ago
103 stars 17 fork 17 watcher
Born at : Aug. 18, 2025, 12:51 p.m. This repo has been linked 2 different CVEs too.

This project demonstrates how penetration testing can be used to assess and strengthen the security of a virtualized network environment. The network is segmented into Trusted, Un-trusted, and DMZ zones, with traffic managed by a pfSense firewall

Updated: 6 days, 1 hour ago
0 stars 0 fork 0 watcher
Born at : Aug. 17, 2025, 10 a.m. This repo has been linked 1 different CVEs too.

Un libro muy completo sobre el ciberdelito y su prevención

Updated: 1 week, 4 days ago
0 stars 0 fork 0 watcher
Born at : Aug. 15, 2025, 9:36 p.m. This repo has been linked 5 different CVEs too.

None

Updated: 1 week, 5 days ago
0 stars 0 fork 0 watcher
Born at : Aug. 15, 2025, 12:09 p.m. This repo has been linked 4 different CVEs too.

None

Updated: 1 week, 5 days ago
0 stars 0 fork 0 watcher
Born at : Aug. 15, 2025, 9:07 a.m. This repo has been linked 310 different CVEs too.

None

Updated: 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Aug. 13, 2025, 1:46 p.m. This repo has been linked 3 different CVEs too.

None

Updated: 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Aug. 12, 2025, 8:38 p.m. This repo has been linked 1 different CVEs too.

Metasploitable 2 Vulnerability Assessment | Full Security Audit & Exploitation Walkthrough A detailed penetration testing report demonstrating the identification and exploitation of critical vulnerabilities in Metasploitable 2—a deliberately vulnerable Linux VM

Updated: 1 week, 4 days ago
0 stars 0 fork 0 watcher
Born at : Aug. 11, 2025, 7:29 p.m. This repo has been linked 3 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2011-2523 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2011-2523 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference http://packetstormsecurity.com/files/162145/vsftpd-2.3.4-Backdoor-Command-Execution.html
    Added Reference https://access.redhat.com/security/cve/cve-2011-2523
    Added Reference https://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.html
    Added Reference https://security-tracker.debian.org/tracker/CVE-2011-2523
    Added Reference https://vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805
    Added Reference https://www.openwall.com/lists/oss-security/2011/07/11/5
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Apr. 12, 2021

    Action Type Old Value New Value
    Added Reference http://packetstormsecurity.com/files/162145/vsftpd-2.3.4-Backdoor-Command-Execution.html [No Types Assigned]
  • CPE Deprecation Remap by [email protected]

    Aug. 18, 2020

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10:*:*:*:*:*:*:* OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
  • Initial Analysis by [email protected]

    Dec. 16, 2019

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:C/I:C/A:C)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://access.redhat.com/security/cve/cve-2011-2523 No Types Assigned https://access.redhat.com/security/cve/cve-2011-2523 Third Party Advisory
    Changed Reference Type https://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.html No Types Assigned https://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.html Exploit, Third Party Advisory, VDB Entry
    Changed Reference Type https://security-tracker.debian.org/tracker/CVE-2011-2523 No Types Assigned https://security-tracker.debian.org/tracker/CVE-2011-2523 Third Party Advisory
    Changed Reference Type https://vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805 No Types Assigned https://vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805 Third Party Advisory
    Changed Reference Type https://www.openwall.com/lists/oss-security/2011/07/11/5 No Types Assigned https://www.openwall.com/lists/oss-security/2011/07/11/5 Mailing List, Third Party Advisory
    Added CWE NIST CWE-78
    Added CPE Configuration OR *cpe:2.3:a:vsftpd_project:vsftpd:2.3.4:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:10:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 9.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Base CVSS Score: 10
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

94.23 }} -0.04%

score

0.99917

percentile