9.8
CRITICAL
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.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

3.9
Public PoC/Exploit Available at Github

CVE-2011-2523 has a 189 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

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
: Total Affected Vendor : 2 | Products : 2
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2011-2523.

URL Resource
http://packetstormsecurity.com/files/162145/vsftpd-2.3.4-Backdoor-Command-Execution.html
https://access.redhat.com/security/cve/cve-2011-2523 Third Party Advisory
https://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.html Exploit Third Party Advisory VDB Entry
https://security-tracker.debian.org/tracker/CVE-2011-2523 Third Party Advisory
https://vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805 Third Party Advisory
https://www.openwall.com/lists/oss-security/2011/07/11/5 Mailing List Third Party Advisory
http://packetstormsecurity.com/files/162145/vsftpd-2.3.4-Backdoor-Command-Execution.html
https://access.redhat.com/security/cve/cve-2011-2523 Third Party Advisory
https://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.html Exploit Third Party Advisory VDB Entry
https://security-tracker.debian.org/tracker/CVE-2011-2523 Third Party Advisory
https://vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805 Third Party Advisory
https://www.openwall.com/lists/oss-security/2011/07/11/5 Mailing List Third Party Advisory

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).

Profile Photo
Raja-jpeg/Ethical-Hacking-Lab

None

Updated: 3 days, 16 hours ago
0 stars 0 fork 0 watcher
Born at : June 11, 2025, 12:05 a.m. This repo has been linked 2 different CVEs too.
Profile Photo
TheMangoMamba/metasploitable-vsftpd

Exploitation of vsftpd 2.3.4 on Metasploitable 2

Updated: 4 days, 4 hours ago
0 stars 0 fork 0 watcher
Born at : June 9, 2025, 11:39 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
HackDreamer/Network-Vulnerability-Scanner

None

Python

Updated: 1 week, 2 days ago
0 stars 0 fork 0 watcher
Born at : June 5, 2025, 8:10 a.m. This repo has been linked 3 different CVEs too.
Profile Photo
Uelsky/SysThreatScan

None

Updated: 1 week, 3 days ago
0 stars 0 fork 0 watcher
Born at : June 4, 2025, 10:17 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
Divakar12p/divakar-manda

None

Updated: 1 week, 4 days ago
0 stars 0 fork 0 watcher
Born at : June 3, 2025, 10:42 a.m. This repo has been linked 3 different CVEs too.
Profile Photo
Anshusharma1239/Simulating-Real-World-Network-Exploitation-and-Defense-Anshu.pdf

None

Updated: 1 week, 5 days ago
0 stars 0 fork 0 watcher
Born at : June 2, 2025, 11:56 a.m. This repo has been linked 2 different CVEs too.
Profile Photo
Prakanth20/Network-Scanner-with-Banner-Grabbing-and-CVE-Detection

None

Python

Updated: 1 week, 5 days ago
0 stars 0 fork 0 watcher
Born at : June 2, 2025, 7:30 a.m. This repo has been linked 3 different CVEs too.
Profile Photo
doval2222/scripts-ciberseguridad

Conjunto de Scripts de prácticas en ciberseguridad ofensiv.

Python

Updated: 2 weeks ago
0 stars 0 fork 0 watcher
Born at : May 30, 2025, 10:41 p.m. This repo has been linked 2 different CVEs too.
Profile Photo
Jyotirditya/metasploitable2-pentest

Vulnerability assessment and exploitation of Metasploitable2 , including Nmap scans, Metasploit modules, and mitigation recommendations."

Updated: 2 weeks, 5 days ago
0 stars 0 fork 0 watcher
Born at : May 26, 2025, 5:11 p.m. This repo has been linked 2 different CVEs too.
Profile Photo
Jyotirditya/metasploitable2-pentest

"Vulnerability assessment and exploitation of Metasploitable2 , including Nmap scans, Metasploit modules, and mitigation recommendations."

Updated: 2 weeks, 5 days ago
0 stars 0 fork 0 watcher
Born at : May 26, 2025, 10:52 a.m. This repo has been linked 2 different CVEs too.
Profile Photo
kalaiyarasan10203/ELEVATE_LABS_INTERNTASKS-NO-1

None

HTML

Updated: 2 weeks, 5 days ago
0 stars 0 fork 0 watcher
Born at : May 26, 2025, 7 a.m. This repo has been linked 2 different CVEs too.
Profile Photo
lekctut/sdb-hw-13-01

None

Updated: 2 weeks, 6 days ago
0 stars 0 fork 0 watcher
Born at : May 25, 2025, 1:14 p.m. This repo has been linked 331 different CVEs too.
Profile Photo
boombebomb/test_secure_scanner

None

Python

Updated: 2 weeks, 5 days ago
0 stars 0 fork 0 watcher
Born at : May 25, 2025, 6:23 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
priyan37/metasploitable2-penetration-test

Full-scope pentesting report on Metasploitable 2

Updated: 2 weeks, 6 days ago
0 stars 0 fork 0 watcher
Born at : May 24, 2025, 6:34 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
Lab2RKSB/PraktikHack

None

Updated: 3 weeks, 1 day ago
0 stars 0 fork 0 watcher
Born at : May 23, 2025, 4:42 a.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.
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)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2011-2523 weaknesses.

Exploit Prediction

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

94.26 }} 0.04%

score

0.99923

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
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Scope
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Latest DB Update: Jun. 14, 2025 18:32