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Fencer Intel
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 5y ago modified 4mo 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

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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, 2026-11-09).

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 Intel 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.