CVE-2020-26299

Name: CVE-2020-26299
Creator: NVD / NIST
Published: 2021-02-10T18:15:12.703+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.6/10EPSS 1.86%

Last modified Jun 17, 2026

CVE-2020-26299 is a critical-severity vulnerability rated 9.6/10 on the CVSS scale. ftp-srv is an open-source FTP server designed to be simple yet configurable. In ftp-srv before version 4.4.0 there is a path-traversal vulnerability. EPSS estimates a 1.86% chance of exploitation in the next 30 days.

Description

ftp-srv is an open-source FTP server designed to be simple yet configurable. In ftp-srv before version 4.4.0 there is a path-traversal vulnerability. Clients of FTP servers utilizing ftp-srv hosted on Windows machines can escape the FTP user's defined root folder using the expected FTP commands, for example, CWD and UPDR. When windows separators exist within the path (`\`), `path.resolve` leaves the upper pointers intact and allows the user to move beyond the root folder defined for that user. We did not take that into account when creating the path resolve function. The issue is patched in version 4.4.0 (commit 457b859450a37cba10ff3c431eb4aa67771122e3).

Metrics

CVSS 3.1

9.6/10

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

EPSS Probability

1.86%

76.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Ftp-Srv Project	Ftp-Srv	< 4.4.0

References

https://github.com/autovance/ftp-srv/commit/457b859450a37cba10ff3c431eb4aa67771122e3Patch, Third Party Advisory
https://github.com/autovance/ftp-srv/issues/167Exploit, Patch, Third Party Advisory
https://github.com/autovance/ftp-srv/issues/225Exploit, Third Party Advisory
https://github.com/autovance/ftp-srv/pull/224Patch, Third Party Advisory
https://github.com/autovance/ftp-srv/security/advisories/GHSA-pmw4-jgxx-pcq9Exploit, Third Party Advisory
https://www.npmjs.com/package/ftp-srvProduct, Third Party Advisory
https://github.com/autovance/ftp-srv/commit/457b859450a37cba10ff3c431eb4aa67771122e3Patch, Third Party Advisory
https://github.com/autovance/ftp-srv/issues/167Exploit, Patch, Third Party Advisory
https://github.com/autovance/ftp-srv/issues/225Exploit, Third Party Advisory
https://github.com/autovance/ftp-srv/pull/224Patch, Third Party Advisory
https://github.com/autovance/ftp-srv/security/advisories/GHSA-pmw4-jgxx-pcq9Exploit, Third Party Advisory
https://www.npmjs.com/package/ftp-srvProduct, Third Party Advisory

Timeline

Published: Feb 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26299?

How severe is CVE-2020-26299?

CVE-2020-26299 has a CVSS score of 9.6/10 (CRITICAL severity). The EPSS model estimates a 1.86% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26299?

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-2020-26299?

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

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Source: NVD / NIST