HOMEVULNERABILITIESCVE-2020-5221
HIGH

CVE-2020-5221

CWE-22Published: January 22, 2020· Updated: Jun 17, 2026

7.2
CVSS v3.1

Official 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

NVD Source

Technical Analysis

CVE-2020-5221 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeChanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Affected Vendors & Products

troglobit1 product(s)
uftpd
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

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

All References (4)

→
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

Quick Facts

CVE IDCVE-2020-5221
CVSS Score7.2 / 10
SeverityHIGH
WeaknessCWE-22
CISA KEVNo
Affected1 vendor(s)
PublishedJan 22, 2020

Related CVEs (CWE-22)

CVE-2008-4486
10.0
CVE-2008-6604
10.0
CVE-2010-5323
10.0
CVE-2008-3150
10.0
CVE-2014-3914
10.0
CVE-2025-58321
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-5221 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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