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Fencer Vulns
critical 9.8

CVE-2020-20277 in the critical feed json

There are multiple unauthenticated directory traversal vulnerabilities in different FTP commands in uftpd FTP server versions 2.7 to 2.10 d…

published 2020-12-18 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-13064

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
26.2%
EPSS 26.2% chance of exploitation in 30 days, percentile 98%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

Timeline

  1. Published
  2. First public exploit (EDB-51000)

Exploit prediction

26.24% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-51000 uftpd 2.10 - Directory Traversal (Authenticated) remote, 2022-08-02
  • packetstormsecurity.com http://packetstormsecurity.com/files/167908/uftpd-2.10-Directory-Traversal.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.