CVE-2010-20121
EasyFTP Server <= 1.7.0.11 CWD Command Stack Buffer Overflow
- State
- Published
- Severity
- 9.3 Critical
- Published
- Aug 21, 2025
- Updated
- May 15, 2026
- Reserved
- Aug 20, 2025
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.”
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | 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 | VulnCheck |
Weaknesses
- CWE-121 Stack-based Buffer Overflow
Affected Products
| Product | Versions |
|---|---|
EasyFTP ServerKMiNT21 Software |
|
References
- https://seclists.org/bugtraq/2010/Feb/202third-party-advisoryexploit
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/easyftp_cwd_fixret.rbexploit
- https://paulmakowski.wordpress.com/2010/02/28/increasing-payload-size-w-return-address-overwrite/technical-descriptionexploit
- https://www.exploit-db.com/exploits/12312exploit
- https://www.exploit-db.com/exploits/16737exploit
- https://www.exploit-db.com/exploits/11668exploit
- https://www.exploit-db.com/exploits/14402exploit
- https://www.vulncheck.com/advisories/easyftp-server-cwd-command-stack-buffer-overflowthird-party-advisory
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