CVE-2020-26299: ftp-srv is an open-source FTP server designed to be simple yet configurable

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MEDIUM 6.3UPGRADE

CVE-2020-26299 is a medium-severity flaw (CVSS 6.3) affecting ftp-srv. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 mo

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-22
Published	2021-02-10
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: ftp-srv project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-02-10 18:15 UTCPublished CVE record published
2026-06-17 03:08 UTCUpdated Record last modified

ftp-srv project ftp-srv UPGRADE

Affected: < 4.4.0

Fixed in: 4.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls ftp-srv

2. UPGRADE to 4.4.0

npm install ftp-srv@">=4.4.0"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-26299?

ftp-srv: upgrade to 4.4.0. Exact commands for each OS are on this page.

Is CVE-2020-26299 being exploited?

CVE-2020-26299 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-26299 affect?

CVE-2020-26299 affects ftp-srv. Severity is medium (CVSS 6.3). 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 use

How urgent is CVE-2020-26299?

Priority 47/100. Public exploit reference

Software pages

Windows vulnerabilities

Related CVEs

CVE-2020-15152 CRITICAL 9.1 UPGRADE ftp-srv is an npm package which is a modern and extensible FTP server designed to be simple yet configurable

References

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