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    CVE-2010-20121

    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.”

    Published:Aug 21, 2025
    Last Modified:Apr 7, 2026
    EPS:Aug 21, 2025
    EPSS Score:0.68643
    CVSS Score:9.8

    Affected Products

    Vendor
    Easyftp Server Project
    Product
    Easyftp Server
    Vendor
    Kmint21 Software
    Product
    Easyftp Server

    Exploits

    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.rbhttps://seclists.org/bugtraq/2010/Feb/202https://www.exploit-db.com/exploits/11668https://www.exploit-db.com/exploits/12312https://www.exploit-db.com/exploits/14402https://www.exploit-db.com/exploits/16737https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/easyftp_cwd_fixret.rbhttps://seclists.org/bugtraq/2010/Feb/202https://www.exploit-db.com/exploits/11668https://www.exploit-db.com/exploits/12312https://www.exploit-db.com/exploits/14402https://www.exploit-db.com/exploits/16737

    Common Weakness Enumeration

    CWE-121 Stack-based Buffer Overflow

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High