# CVE-2010-20121

## Summary

- **CVE ID:** CVE-2010-20121
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-121
- **Published:** Aug 21, 2025
- **Last Modified:** May 15, 2026

## 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.”

## Affected Products

- KMiNT21 Software — EasyFTP Server (*)
- KMiNT21 Software — EasyFTP Server (0)

## References

- [CNA](https://seclists.org/bugtraq/2010/Feb/202)
- [CNA](https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/easyftp_cwd_fixret.rb)
- [CNA](https://paulmakowski.wordpress.com/2010/02/28/increasing-payload-size-w-return-address-overwrite/)
- [CNA](https://www.exploit-db.com/exploits/12312)
- [CNA](https://www.exploit-db.com/exploits/16737)
- [CNA](https://www.exploit-db.com/exploits/11668)
- [CNA](https://www.exploit-db.com/exploits/14402)
- [CNA](https://www.vulncheck.com/advisories/easyftp-server-cwd-command-stack-buffer-overflow)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 68.64%
- **EPSS Percentile:** 98.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._