CVE-2020-5221 json
Directory Traversal (Chroot Escape) vulnerability in uftpd
published 2020-01-22 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-26455
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 67%
- public exploits
- 0
- none known
Summary
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
Patch / fix
Exploit prediction
1.16% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/troglobit/uftpd/security/advisories/GHSA-wmx8-v7mx-6x9h referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L |
| NVD | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 6.4 | AV:N/AC:L/Au:N/C:P/I:P/A:N |
Affected products
- troglobit uftpd
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
-
github.com
/troglobit/uftpd/commit/455b47d3756aed162d2d0ef7f40b549f3b5b30fe
patch, third-party-advisory
-
github.com
/troglobit/uftpd/security/advisories/GHSA-wmx8-v7mx-6x9h
exploit, third-party-advisory
Sources
- CVE List CVE-2020-5221
- NVD CVE-2020-5221
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