HOMEVULNERABILITIESCVE-2020-20277
CRITICALPOC

CVE-2020-20277

CWE-22Published: December 18, 2020· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

There are multiple unauthenticated directory traversal vulnerabilities in different FTP commands in uftpd FTP server versions 2.7 to 2.10 due to improper implementation of a chroot jail in common.c's compose_abspath function that can be abused to read or write to arbitrary files on the filesystem, leak process memory, or potentially lead to remote code execution.

NVD Source

Technical Analysis

CVE-2020-20277 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.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

A proof-of-concept (PoC) exploit exists for CVE-2020-20277. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

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

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
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
ADVISORYhttp://packetstormsecurity.com/files/167908/uftpd-2.10-Directory-Traversal.html
ADVISORYhttps://arinerron.com/blog/posts/6
ADVISORYhttp://packetstormsecurity.com/files/167908/uftpd-2.10-Directory-Traversal.html
ADVISORYhttps://arinerron.com/blog/posts/6

All References (6)

→
http://packetstormsecurity.com/files/167908/uftpd-2.10-Directory-Traversal.htmlExploit · Third Party Advisory · VDB Entry
→
https://arinerron.com/blog/posts/6Third Party Advisory
→
https://github.com/troglobit/uftpd/commit/455b47d3756aed162d2d0ef7f40b549f3b5b30fePatch · Third Party Advisory
→
http://packetstormsecurity.com/files/167908/uftpd-2.10-Directory-Traversal.htmlExploit · Third Party Advisory · VDB Entry
→
https://arinerron.com/blog/posts/6Third Party Advisory
→
https://github.com/troglobit/uftpd/commit/455b47d3756aed162d2d0ef7f40b549f3b5b30fePatch · Third Party Advisory

Quick Facts

CVE IDCVE-2020-20277
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-22
CISA KEVNo
ExploitPOC
Affected1 vendor(s)
PublishedDec 18, 2020

Related CVEs (CWE-22)

CVE-2015-0779
10.0
CVE-2014-3914
10.0
CVE-2026-59555
10.0
CVE-2013-6221
10.0
CVE-2010-5323
10.0
CVE-2008-6833
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-20277 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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