CVE-2010-20121

CRITICAL EPSS 85.8%
Published Aug 21, 202510mo ago · Modified Jun 16, 20261w ago
9.3 CVSS 4.0
Critical
Find Similar
Published Aug 21, 2025 10mo ago
Last Modified Jun 16, 2026 1w ago

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 Details

Base Score
9.3
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
85.8% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 1

CWE-121

Affected Products 1

VendorProductVersionRange
easyftp_server_projecteasyftp_server* <1.7.0.12

References 8

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.