CVE-2025-34047

Leadsec VPN Path Traversal Arbitrary File Read

State: Published
Severity: 8.7 High
Published: Jun 26, 2025
Updated: Dec 23, 2025
Reserved: Apr 15, 2025

Description

A path traversal vulnerability exists in the Leadsec SSL VPN (formerly Lenovo NetGuard), allowing unauthenticated attackers to read arbitrary files on the underlying system via the ostype parameter in the /vpn/user/download/client endpoint. This flaw arises from insufficient input sanitation, enabling traversal sequences to escape the intended directory and access sensitive files. Exploitation evidence was observed by the Shadowserver Foundation on 2025-02-05 UTC.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	VulnCheck

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-20 Improper Input Validation

Affected Products

Product	Versions
Leadsec SSL VPNBeijing NetGuard Nebula Information Technology Co., Ltd.	0Affected

References

https://www.cnvd.org.cn/flaw/show/CNVD-2021-64035third-party-advisory
https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cnvd/2021/CNVD-2021-64035.yamlexploit
https://www.leadsec.com.cn/product
https://vulncheck.com/advisories/leadsec-vpn-path-traversal-file-readthird-party-advisory

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