CVE-2011-2523

vsftpd 2.3.4 - Backdoor Command Execution

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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

vsftpd versión 2.3.4 descargado entre 20110630 y 20110703, contiene una puerta trasera (backdoor) que abre un shell en el puerto 6200/tcp.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2011-06-15 CVE Reserved
2019-11-27 CVE Published
2021-04-12 First Exploit
2024-08-06 CVE Updated
2025-07-16 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CAPEC

References (37)

URL	Tag	Source
http://packetstormsecurity.com/files/162145/vsftpd-2.3.4-Backdoor-Command-Execution.html	X_refsource_misc
https://access.redhat.com/security/cve/cve-2011-2523	Third Party Advisory
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

URL	Date	SRC
https://packetstorm.news/files/id/162145	2021-04-12
https://www.exploit-db.com/exploits/49757	2021-07-16
https://www.exploit-db.com/exploits/17491	2021-04-12
https://github.com/padsalatushal/CVE-2011-2523	2023-01-08
https://github.com/Lynk4/CVE-2011-2523	2023-05-09
https://github.com/cowsecurity/CVE-2011-2523	2023-02-05
https://github.com/4m3rr0r/CVE-2011-2523-poc	2023-11-28
https://github.com/nobodyatall648/CVE-2011-2523	2021-06-25
https://github.com/MFernstrom/OffensivePascal-CVE-2011-2523	2022-05-28
https://github.com/0xSojalSec/-CVE-2011-2523	2022-06-09
https://github.com/0xSojalSec/CVE-2011-2523	2022-06-09
https://github.com/Gr4ykt/CVE-2011-2523	2021-08-31
https://github.com/vaishnavucv/CVE-2011-2523	2023-10-16
https://github.com/XiangSi-Howard/CTF---CVE-2011-2523	2022-12-04
https://github.com/Shubham-2k1/Exploit-CVE-2011-2523	2024-03-05
https://github.com/HerculesRD/vsftpd2.3.4PyExploit	2021-04-12
https://github.com/chleba124/vsftpd-exploit	2024-03-02
https://github.com/Tenor-Z/SmileySploit	2024-04-23
https://github.com/0xB0y426/CVE-2011-2523-PoC	2024-09-15
https://github.com/sug4r-wr41th/CVE-2011-2523	2024-11-22
https://github.com/AnugiArrawwala/CVE-Research	2024-07-03
https://github.com/Gill-Singh-A/vsFTP-2.3.4-Remote-Root-Shell-Exploit	2024-11-20
https://github.com/everythingBlackkk/vsFTPd-Backdoor-Exploit-CVE-2011-2523-	2024-09-15
https://github.com/NullBrunk/CVE-2011-2523	2024-12-26
https://github.com/Lychi3/vsftpd-backdoor	2025-02-20
https://github.com/vedpakhare/vsftpd-234-vuln-report	2025-04-05
https://github.com/madanokr001/CVE-2011-2523	2025-04-06
https://github.com/JohanMV/explotacion-vsftpd-nmap_Laboratorio_1	2025-04-14
https://github.com/lghost256/vsftpd234-exploit	2025-06-19
https://github.com/hklabCR/CVE-2011-2523	2025-07-06
https://github.com/krill-x7/CVE-2011-2523	2025-07-12
https://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.html	2024-08-06

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Vsftpd Project Search vendor "Vsftpd Project"		Vsftpd Search vendor "Vsftpd Project" for product "Vsftpd"				2.3.4 Search vendor "Vsftpd Project" for product "Vsftpd" and version "2.3.4"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected