CVE-2020-20277Uftpd Path Traversal
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…
Published Dec 18, 2020 · Updated Jul 8, 2026
Key Facts
Patch immediately- CVE-2020-20277 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Uftpd (Troglobit).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 26% probability of exploitation in the next 30 days.
- Fixed versions are available, including Uftpd <=2.10, Uftpd 2.10.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
26%
Higher than 97.9% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
42/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
2
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
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.
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| UftpdTroglobit | See advisory | 2.10 |
Patched Releases
Uftpd
<=2.10
Timeline
Publicly disclosed
Dec 18, 2020
Last updated
Jul 8, 2026
Weakness Type
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
References
FAQ
Common Questions.
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,…
Affected: Uftpd (Troglobit). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Uftpd <=2.10, Uftpd 2.10.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2020-20277 On Your Attack Surface?
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