What’s Vulnerable › Vulnerabilities
CVE-2010-20121: EasyFTP Server <= 1.7.0.11 CWD Command Stack Buffer Overflow
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 4.6% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2025-08-21 · updated 2026-06-16
- Weakness: CWE-121
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: before 1.7.0.12 — fixed in 1.7.0.12
How to fix
Upgrade to a fixed version: KMiNT21 Software EasyFTP Server 1.7.0.12. Check the vendor advisory for mitigations.
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
Get alerted when CVE-2010-20121 or the next vulnerability affects your stack