6.8

CVE-2025-9708: kubernetes kubernetes csharp client Improper Certificate Validation

CVSS: 6.8v3.1MediumDeferred
AliasesCGA-42gr-h938-5pq4CGA-73p2-49rg-hhhjCGA-8j7w-2hc8-f447
Published 16-09-2025Last modified 04-11-2025
Open JSON

Vulnerability summary

CVE-2025-9708 is a medium (CVSS 6.8) Improper Certificate Validation vulnerability in kubernetes kubernetes csharp client. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 22.3% of scored vulnerabilities.

Overall risk
27/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.8/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.31%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 2
CGA-F2MW-R68J-48WCCGA-MWP4-XMF2-C5P5

Timeline

  1. 16-09-2025
    PublishedVulnerability first disclosed.
  2. 04-11-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.31%

Chance of exploitation in the next 30 days

Percentile

22%

Versus all other CVEs

30-day change

0.00 pp

From 0.31% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.31%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard2 products
  • kubernetes-reflector< 9.1.31-r1
  • kubernetes-reflector-compat< 9.1.31-r1
Wolfi2 products
  • kubernetes-reflector< 9.1.31-r1
  • kubernetes-reflector-compat< 9.1.31-r1
Kubernetes1 product
NuGet1 product
  • KubernetesClient< 17.0.14

4 vendors · 6 products

References

5 links