KMiNT21 EasyFTP Server up to 1.7.0.11 CWD Command stack-based overflow

Summaryinfo

A vulnerability described as critical has been identified in KMiNT21 EasyFTP Server up to 1.7.0.11. This issue affects some unknown processing of the component CWD Command Handler. Executing a manipulation can lead to stack-based overflow. This vulnerability is tracked as CVE-2010-20121. The attack can be launched remotely. Moreover, an exploit is present.

Detailsinfo

A vulnerability has been found in KMiNT21 EasyFTP Server up to 1.7.0.11 and classified as critical. This vulnerability affects an unknown code block of the component CWD Command Handler. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.”

The weakness was disclosed by Paul Makowski. The advisory is available at seclists.org. This vulnerability was named CVE-2010-20121 since 08/20/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are unknown but a public exploit is available.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Exploit-DB (11668). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• File Transfer Software

Vendor

• KMiNT21

Name

• EasyFTP Server

Version

• 1.7.0.0
• 1.7.0.1
• 1.7.0.2
• 1.7.0.3
• 1.7.0.4
• 1.7.0.5
• 1.7.0.6
• 1.7.0.7
• 1.7.0.8
• 1.7.0.9
• 1.7.0.10
• 1.7.0.11

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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