Path Traversal Vulnerability in Leadsec SSL VPN Software
CVE-2025-34047

8.7HIGH

Key Information:

Vendor

Beijing Netguard Nebula Information Technology Co., Ltd.

Status
Leadsec Ssl Vpn
Vendor
CVE Published:
26 June 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-34047?

A path traversal vulnerability has been identified in Leadsec SSL VPN, formerly known as Lenovo NetGuard. This issue allows unauthenticated attackers to exploit the ostype parameter in the /vpn/user/download/client endpoint, enabling them to read arbitrary files from the underlying system. The vulnerability stems from insufficient input validation, allowing attackers to utilize traversal sequences that bypass the designated directory restrictions and access sensitive files that should be protected.

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Affected Version(s)

Leadsec SSL VPN 0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-34047 - Proof of Concept

References

https://www.cnvd.org.cn/flaw/show/CNVD-2021-64035
third-party-advisory
https://github.com/projectdiscovery/nuclei-templates/blob...
exploit
https://www.leadsec.com.cn/
product

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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