ColoradoFTP Server <= 1.3 Build 8 Path Traversal Information Disclosure

published 2025-07-15 15 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-21436

cvss: 9.3; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.9%; EPSS 1.9% chance of exploitation in 30 days, percentile 80%
public exploits: 1; Metasploit

A directory traversal vulnerability exists in ColoradoFTP Server ≤ 1.3 Build 8 for Windows, allowing unauthenticated attackers to read or write arbitrary files outside the configured FTP root directory. The flaw is due to insufficient sanitation of user-supplied file paths in the FTP GET and PUT command handlers. Exploitation is possible by submitting traversal sequences during FTP operations, enabling access to system-sensitive files. This issue affects only the Windows version of ColoradoFTP.

Patch / fix

links 1

bitbucket.org/nolife/coloradoftp@16a60c4 commit

Timeline

2016-08-11 First public exploit (Metasploit auxiliary/scanner/ftp/colorado_ftp_traversal)
2025-07-15 Published

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 15 mo ago (2025-07-15)

Exploit prediction

1.93% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Metasploit auxiliary/scanner/ftp/colorado_ftp_traversal ColoradoFTP Server 1.3 Build 8 Directory Traversal Information Disclosure metasploit auxiliary, normal rank, 2016-08-11
raw.githubusercontent.com https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/scanner/ftp/colorado_ftp_traversal.rb referenced PoC, tagged "exploit" by a source, unverified
exploit-db.com https://www.exploit-db.com/exploits/40231 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	9.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
CNA	4.0	9.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

ColoradoFTP Server

Classification

Weakness

CWE-22 Improper Limitation of a Pathname to a Restricted Directory
CWE-552 Files or Directories Accessible to External Parties
CWE-306 Missing Authentication for Critical Functionality

References

Sources

CVE List CVE-2025-34110
NVD CVE-2025-34110

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.

Summary