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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.

PUBLISHED Reserved 2025-04-15 | Published 2025-06-26 | Updated 2025-12-23 | Assigner VulnCheck




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Problem types

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

CWE-20 Improper Input Validation

Product status

Default status
unaffected

Any version
affected

References

github.com/.../blob/main/http/cnvd/2021/CNVD-2021-64035.yaml exploit

www.cnvd.org.cn/flaw/show/CNVD-2021-64035 third-party-advisory

github.com/.../blob/main/http/cnvd/2021/CNVD-2021-64035.yaml exploit

www.leadsec.com.cn/ product

vulncheck.com/...sories/leadsec-vpn-path-traversal-file-read third-party-advisory

cve.org (CVE-2025-34047)

nvd.nist.gov (CVE-2025-34047)

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