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CVE-2010-20121 Details

Description

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.”

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/easyftp_cwd_fixret.rb	CISA-ADP	Exploit
https://seclists.org/bugtraq/2010/Feb/202	CISA-ADP	ExploitMailing ListThird Party Advisory
https://www.exploit-db.com/exploits/11668	CISA-ADP	ExploitVDB Entry
https://www.exploit-db.com/exploits/12312	CISA-ADP	ExploitVDB Entry
https://www.exploit-db.com/exploits/14402	CISA-ADP	ExploitVDB Entry
https://www.exploit-db.com/exploits/16737	CISA-ADP	ExploitVDB Entry
https://paulmakowski.wordpress.com/2010/02/28/increasing-payload-size-w-return-address-overwrite/	[email protected]	ExploitThird Party Advisory
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/easyftp_cwd_fixret.rb	[email protected]	Exploit
https://seclists.org/bugtraq/2010/Feb/202	[email protected]	ExploitMailing ListThird Party Advisory
https://www.exploit-db.com/exploits/11668	[email protected]	ExploitVDB Entry
https://www.exploit-db.com/exploits/12312	[email protected]	ExploitVDB Entry
https://www.exploit-db.com/exploits/14402	[email protected]	ExploitVDB Entry
https://www.exploit-db.com/exploits/16737	[email protected]	ExploitVDB Entry
https://www.vulncheck.com/advisories/easyftp-server-cwd-command-stack-buffer-overflow	[email protected]	Third Party Advisory

see all 14 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-121	Stack-based Buffer Overflow	[email protected]

Affected Products

Product	Versions
easyftp server project easyftp server	< 1.7.0.12
CPE cpe:2.3:a:easyftp_server_project:easyftp_server:::::::: Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Jun 16, 2026	CVE Modified	[email protected]
Jun 16, 2026	CVE Modified	CISA-ADP
Sep 10, 2025	Initial Analysis	[email protected]
Aug 22, 2025	CVE Modified	CISA-ADP
Aug 21, 2025	New CVE Received	[email protected]