Stack-Based Buffer Overflow in EasyFTP Server by EasyFTP
CVE-2010-20121

9.3CRITICAL

Key Information:

Vendor

Kmint21 Software

Status
Easyftp Server
Vendor
CVE Published:
21 August 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2010-20121?

EasyFTP Server versions up to 1.7.0.11 are susceptible to a stack-based buffer overflow in the FTP command parser, specifically when handling the CWD (Change Working Directory) command. The server insufficiently validates the length of the input string, allowing attackers to overwrite memory on the stack. This leads to the potential for remote code execution without requiring authentication, as the server permits anonymous access by default. The issue was addressed in version 1.7.0.12, which afterwards rebranded the product as UplusFtp.

Affected Version(s)

EasyFTP Server * <= 1.7.0.11

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2010-20121 - Proof of Concept

CVE-2010-20121 - Proof of Concept

CVE-2010-20121 - Proof of Concept

References

https://seclists.org/bugtraq/2010/Feb/202
third-party-advisoryexploit
https://raw.githubusercontent.com/rapid7/metasploit-frame...
exploit
https://paulmakowski.wordpress.com/2010/02/28/increasing-...
technical-descriptionexploit

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Paul Makowski
.
CVE-2010-20121 : Stack-Based Buffer Overflow in EasyFTP Server by EasyFTP