CVE-2010-20121

EasyFTP Server versions up to 1.7.0.11 contain a stack-based buffer overflow vulnerability in the FTP command parser. When processing the CWD (Change Working Directory) command, the server fails to properly validate the length of the input string, allowing attackers to overwrite memory on the stack. This flaw enables remote code execution without authentication, as EasyFTP allows anonymous access by default. The vulnerability was resolved in version 1.7.0.12, after which the product was renamed “UplusFtp.”

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://paulmakowski.wordpress.com/2010/02/28/increasing-payload-size-w-return-address-overwrite/	Exploit Third Party Advisory
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/easyftp_cwd_fixret.rb	Exploit
https://seclists.org/bugtraq/2010/Feb/202	Exploit Mailing List Third Party Advisory
https://www.exploit-db.com/exploits/11668	Exploit VDB Entry
https://www.exploit-db.com/exploits/12312	Exploit VDB Entry
https://www.exploit-db.com/exploits/14402	Exploit VDB Entry
https://www.exploit-db.com/exploits/16737	Exploit VDB Entry
https://www.vulncheck.com/advisories/easyftp-server-cwd-command-stack-buffer-overflow	Third Party Advisory
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/easyftp_cwd_fixret.rb	Exploit
https://seclists.org/bugtraq/2010/Feb/202	Exploit Mailing List Third Party Advisory
https://www.exploit-db.com/exploits/11668	Exploit VDB Entry
https://www.exploit-db.com/exploits/12312	Exploit VDB Entry
https://www.exploit-db.com/exploits/14402	Exploit VDB Entry
https://www.exploit-db.com/exploits/16737	Exploit VDB Entry

Configurations

Configuration 1 (hide)

cpe:2.3:a:easyftp_server_project:easyftp_server:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2025-08-21 20:15

Updated : 2025-09-10 20:03

NVD link : CVE-2010-20121

Mitre link : CVE-2010-20121

CVE.ORG link : CVE-2010-20121

JSON object : View

Products Affected

easyftp_server_project

easyftp_server

CWE

CWE-121

Stack-based Buffer Overflow

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When processing the CWD (Change Working Directory) command, the server fails to properly validate the length of the input string, allowing attackers to overwrite memory on the stack. This flaw enables remote code execution without authentication, as EasyFTP allows anonymous access by default. The vulnerability was resolved in version 1.7.0.12, after which the product was renamed \u201cUplusFtp.\u201d"}, {"lang": "es", "value": "Las versiones de EasyFTP Server hasta la 1.7.0.11 contienen una vulnerabilidad de desbordamiento de b\u00fafer en la pila del analizador de comandos FTP. Al procesar el comando CWD (Cambiar directorio de trabajo), el servidor no valida correctamente la longitud de la cadena de entrada, lo que permite a los atacantes sobrescribir la memoria en la pila. Esta falla permite la ejecuci\u00f3n remota de c\u00f3digo sin autenticaci\u00f3n, ya que EasyFTP permite el acceso an\u00f3nimo por defecto. La vulnerabilidad se resolvi\u00f3 en la versi\u00f3n 1.7.0.12, tras la cual el producto pas\u00f3 a llamarse \"UplusFtp\"."}], "lastModified": "2025-09-10T20:03:36.037", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:easyftp_server_project:easyftp_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C588FCA3-A10E-4DD4-9042-5EF4748FAEBA", "versionEndExcluding": "1.7.0.12"}], "operator": "OR"}]}], "sourceIdentifier": "[email protected]"}