CVE-2010-20121: Easyftp Server Project Easyftp Server remote code execution (CVSS 9.8)

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.”

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Easyftp Server Project Easyftp Server< 1.7.0.12

Remediation

Fixed in

Easyftp Server Project Easyftp Server≥ 1.7.0.12

References

https://paulmakowski.wordpress.com/2010/02/28/increasing-payload-size-w-return-address-overwrite/ExploitThird Party Advisory
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/easyftp_cwd_fixret.rbExploit
https://seclists.org/bugtraq/2010/Feb/202ExploitMailing ListThird Party Advisory
https://www.exploit-db.com/exploits/11668ExploitVDB Entry
https://www.exploit-db.com/exploits/12312ExploitVDB Entry
https://www.exploit-db.com/exploits/14402ExploitVDB Entry
https://www.exploit-db.com/exploits/16737ExploitVDB Entry
https://www.vulncheck.com/advisories/easyftp-server-cwd-command-stack-buffer-overflowThird Party Advisory

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2010-20121 being actively exploited?

CVE-2010-20121 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 3.22%.

How severe is CVE-2010-20121?

CVE-2010-20121 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 3.22% probability of exploitation.

Which products are affected by CVE-2010-20121?

Affected products include Easyftp Server Project Easyftp Server.

How do I fix CVE-2010-20121?

Upgrade affected software to a fixed version, for example Easyftp Server Project Easyftp Server 1.7.0.12 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2010-20121 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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