CVE-2020-5221

Name: CVE-2020-5221
Creator: NVD / NIST
Published: 2020-01-22T19:15:13.127+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 1.16%

Last modified Jun 17, 2026

CVE-2020-5221 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. 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. EPSS estimates a 1.16% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

7.2/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS Probability

1.16%

63.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Troglobit	Uftpd	< 2.11

References

https://github.com/troglobit/uftpd/commit/455b47d3756aed162d2d0ef7f40b549f3b5b30fePatch, Third Party Advisory
https://github.com/troglobit/uftpd/security/advisories/GHSA-wmx8-v7mx-6x9hExploit, Third Party Advisory
https://github.com/troglobit/uftpd/commit/455b47d3756aed162d2d0ef7f40b549f3b5b30fePatch, Third Party Advisory
https://github.com/troglobit/uftpd/security/advisories/GHSA-wmx8-v7mx-6x9hExploit, Third Party Advisory

Timeline

Published: Jan 22, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-5221?

How severe is CVE-2020-5221?

CVE-2020-5221 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 1.16% probability of exploitation in the next 30 days.

How do I fix CVE-2020-5221?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-5221?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST