What is CVE-2025-9708?

CVE-2025-9708 is a medium-severity vulnerability in Kubernetes Csharp Client, classified under Improper Certificate Validation. CVSS score: 6.8/10. Published 2025-09-16.

How severe is CVE-2025-9708?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Is CVE-2025-9708 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Kubernetes Csharp Client

CVE-2025-9708

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.

Vulnerability class: Improper Certificate Validation

EPSS: 0.003 (21.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.

Affected products

Kubernetes Csharp Client — versions 0, 17.0.14

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

Frequently asked questions

What is CVE-2025-9708?: CVE-2025-9708 is a medium-severity vulnerability in Kubernetes Csharp Client, classified under Improper Certificate Validation. CVSS score: 6.8/10. Published 2025-09-16.
How severe is CVE-2025-9708?: Medium severity. CVSS v3 base score is 6.8 out of 10.
Is CVE-2025-9708 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.