CVE-2010-20121

21.08.2025, 20:15

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	NIST	UNKNOWN				---
VulnCheck	CNA	---				---
CISA-ADP	ADP	---				---

Awaiting analysis

This vulnerability is currently awaiting analysis.

Base Score

CVSS 3.x

EPSS Score

Percentile: 70%

Common Weakness Enumeration

CWE-121 - Stack-based Buffer Overflow
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

References

https://paulmakowski.wordpress.com/2010/02/28/increasing-payload-size-w-return-address-overwrite/

https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/easyftp_cwd_fixret.rb

https://seclists.org/bugtraq/2010/Feb/202

https://www.exploit-db.com/exploits/11668

https://www.exploit-db.com/exploits/12312

https://www.exploit-db.com/exploits/14402

https://www.exploit-db.com/exploits/16737

https://www.vulncheck.com/advisories/easyftp-server-cwd-command-stack-buffer-overflow

https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/easyftp_cwd_fixret.rb

https://seclists.org/bugtraq/2010/Feb/202

https://www.exploit-db.com/exploits/11668

https://www.exploit-db.com/exploits/12312

https://www.exploit-db.com/exploits/14402

https://www.exploit-db.com/exploits/16737