CVE-2025-34047

Leadsec VPN Path Traversal Arbitrary File Read

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.

Affected

Beijing NetGuard Nebula Information Technology Co., Ltd. · Leadsec SSL VPN

CVSS v4.0 VULNCHECK

8.7 HIGHCVSS: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

EPSS

0.55% chance of exploitation in the next 30 days, 45th percentile

Published

2025-06-26

Updated

2025-12-23

Proof-of-concept exploits (1)

• projectdiscovery/nuclei-templates/blob/main/http/cnvd/2021/CNVD-2021-64035.yaml13104★ · 2026-10-16

References

• CVE Record
• NVD entry

Related

• CVE-2021-4461
• CVE-2023-7330
• CVE-2025-34046