CVE-2025-9708— Kubernetes C# Client: improper certificate validation in custom CA mode may lead to man-in-the-middle attacks
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I. Basic Information for CVE-2025-9708
Vulnerability Information
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Vulnerability Title
Kubernetes C# Client: improper certificate validation in custom CA mode may lead to man-in-the-middle attacks
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability exists in the Kubernetes C# client where the certificate validation logic accepts properly constructed certificates from any Certificate Authority (CA) without properly verifying the trust chain. This flaw allows a malicious actor to present a forged certificate and potentially intercept or manipulate communication with the Kubernetes API server, leading to possible man-in-the-middle attacks and API impersonation.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
证书验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Kubernetes 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubernetes（K8s）是Kubernetes开源的一个开源系统，用于自动部署、扩展和管理容器化应用程序。 Kubernetes存在安全漏洞，该漏洞源于证书验证逻辑未正确验证信任链，可能导致中间人攻击和API冒充。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Kubernetes | Kubernetes CSharp Client | 0 ~ 17.0.13 | - |
II. Public POCs for CVE-2025-9708
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|---|
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IV. Related Vulnerabilities
Same vendor: Kubernetes
- CVE-2026-3864
CSI Driver for NFS path traversal via subDir may delete unin - CVE-2026-4342
ingress-nginx comment-based nginx configuration injection - CVE-2026-3288
ingress-nginx rewrite-target nginx configuration injection - CVE-2025-15566
ingress-nginx auth-proxy-set-headers nginx configuration inj - CVE-2026-24514
ingress-nginx Admission Controller denial of service
Same weakness: CWE-295
V. Comments for CVE-2025-9708
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