What’s Vulnerable › Vulnerabilities

CVE-2021-25740: Holes in EndpointSlice Validation Enable Host Network Hijack

• Severity: low (CVSS 3.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-20 · updated 2026-06-17
• Weakness: CWE-441

Description

A security issue was discovered with Kubernetes that could enable users to send network traffic to locations they would otherwise not have access to via a confused deputy attack.

Affected products

• Kubernetes: all versions

References

• https://github.com/kubernetes/kubernetes/issues/103675
• https://groups.google.com/g/kubernetes-security-announce/c/WYE9ptrhSLE
• https://kubernetes.io/blog/2026/05/26/reconciling-unfixed-kubernetes-cves/
• https://security.netapp.com/advisory/ntap-20211014-0001/
• https://github.com/kubernetes/kubernetes/issues/103675
• https://groups.google.com/g/kubernetes-security-announce/c/WYE9ptrhSLE
• https://security.netapp.com/advisory/ntap-20211014-0001/

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