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CVE-2010-20121

9.8 · CRITICAL

EasyFTP Server versions up to 1.7.0.11 contain a stack-based buffer overflow vulnerability in the FTP command parser.

Published Aug 21, 2025CWE-121EPSS 4.60%

Overview

CVE-2010-20121 is a critical-severity vulnerability. It was published on August 21, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.”

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpaulmakowski.wordpress.com/2010/02/28/increasing-payload-size-w-return-address-overwrite/Refraw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/easyftp_cwd_fixret.rbRefseclists.org/bugtraq/2010/Feb/202Refwww.exploit-db.com/exploits/11668Refwww.exploit-db.com/exploits/12312Refwww.exploit-db.com/exploits/14402Refwww.exploit-db.com/exploits/16737Refwww.vulncheck.com/advisories/easyftp-server-cwd-command-stack-buffer-overflowRefraw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/easyftp_cwd_fixret.rbRefseclists.org/bugtraq/2010/Feb/202

How CyberStrike helps

Frequently asked questions

What is CVE-2010-20121?

CVE-2010-20121 is a critical-severity vulnerability. It was published on August 21, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2010-20121?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2010-20121?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2010-20121?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2010-20121 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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