Linknat VOS Manager Path Traversal File Disclosure

published 2025-07-16 15 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-21752

cvss: 8.7; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 2.3%; EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits: 1; Metasploit

A path traversal vulnerability exists in Linknat VOS Manager versions prior to 2.1.9.07, including VOS2009 and early VOS3000 builds, that allows unauthenticated remote attackers to read arbitrary files on the server. The vulnerability is accessible via multiple localized subpaths such as '/eng/', '/chs/', or '/cht/', where the 'js/lang_en_us.js' or equivalent files are loaded. By injecting encoded traversal sequences such as '%c0%ae%c0%ae' into the request path, attackers can bypass input validation and disclose sensitive files.

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 15 mo ago (2025-07-17)

Exploit prediction

2.35% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Metasploit auxiliary/scanner/http/linknat_vos_traversal Linknat Vos Manager Traversal metasploit auxiliary, normal rank
raw.githubusercontent.com https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/scanner/http/linknat_vos_traversal.rb referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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

Linknat Technology VOS Manager

Classification

Weakness

CWE-22 Improper Limitation of a Pathname to a Restricted Directory
CWE-20 Improper Input Validation

References

raw.githubusercontent.com /rapid7/metasploit-framework/master/modules/auxiliary/scanner/http/linknat_vos_traversal.rb
exploit
linknat.com /
product
web.archive.org /web/20151013001957/http://www.wooyun.org/bugs/wooyun-2010-0145458
third-party-advisory
vulncheck.com /advisories/linknat-vos-manager-path-traversal-file-disclosure
third-party-advisory

Sources

CVE List CVE-2025-34118
NVD CVE-2025-34118

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