Vulnerability details
CVE-2025-34047
Beijing NetGuard Nebula Information Technology Leadsec SSL VPN
Leadsec VPN Path Traversal Arbitrary File Read
CVSS 4.0
8.7High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.7High | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Beijing NetGuard Nebula Information Technology Co., Ltd. | Leadsec SSL VPN | All | CVEProject cvelistV5 (CNA) |
References and advisories
4- https://www.cnvd.org.cn/flaw/show/CNVD-2021-64035 third-party-advisory
- https://www.leadsec.com.cn/ product
- https://vulncheck.com/advisories/leadsec-vpn-path-traversal-file-read third-party-advisory
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cnvd/2021/CNVD-2021-64035.yaml exploit
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Details
- Published
- 2025-06-26
- Last updated
- 2025-12-23
- State
- Published
- Assigner (CNA)
- VulnCheck
Exploit prediction (EPSS)
0.54%
Probability of exploitation in 30 days
46%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- CWE-20Improper Input Validation