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CVE-2020-20277

54
FAUCET Score

CVE-2020-20277 describes multiple unauthenticated directory traversal vulnerabilities in troglobit uftpd FTP server versions 2.7 to 2.10. These flaws, stemming from improper chroot jail implementation, allow attackers to read or write arbitrary files, leak process memory, or potentially achieve remote code execution. With a CVSS score of 9.8 (Critical), this vulnerability is easily exploitable over the network with no authentication or user interaction required, leading to complete compromise of confidentiality, integrity, and availability. While not currently listed in CISA's KEV catalog, an authenticated exploit for directory traversal exists on ExploitDB, though there is no evidence of active exploitation or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.7, <= 2.10CPE matchmatch criteria
cpe:2.3:a:troglobit:uftpd:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
25.25%
Probability of exploitation in next 30 days
EPSS Percentile
97.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-51000 · Aug 2, 2022
This CVE's current EPSS score of 0.2525 is in the 95th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

packetstormsecurity.com / files/167908/uftpd-2.10-Directory-Traversal.html
ExploitThird Party AdvisoryVDB Entry
arinerron.com / blog/posts/6
Third Party Advisory
github.com / troglobit/uftpd/commit/455b47d3756aed162d2d0ef7f40b549f3b5b30fe
PatchThird Party Advisory