Vulnerability Description
Kube-proxy on Windows can unintentionally forward traffic to local processes listening on the same port (“spec.ports[*].port”) as a LoadBalancer Service when the LoadBalancer controller does not set the “status.loadBalancer.ingress[].ip” field. Clusters where the LoadBalancer controller sets the “status.loadBalancer.ingress[].ip” field are unaffected.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Kubernetes | Kubernetes | >= 1.18.0, < 1.18.18 |
| Microsoft | Windows | - |
Related Weaknesses (CWE)
References
- https://github.com/kubernetes/kubernetes/pull/99958Third Party Advisory
- https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazMailing ListThird Party Advisory
- https://security.netapp.com/advisory/ntap-20231221-0003/
- https://github.com/kubernetes/kubernetes/pull/99958Third Party Advisory
- https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazMailing ListThird Party Advisory
- https://security.netapp.com/advisory/ntap-20231221-0003/
FAQ
What is CVE-2021-25736?
CVE-2021-25736 is a vulnerability with a CVSS score of 5.8 (MEDIUM). Kube-proxy on Windows can unintentionally forward traffic to local processes listening on the same port (“spec.ports[*].port”) as a LoadBalancer Service when the LoadBalancer controller does not s...
How severe is CVE-2021-25736?
CVE-2021-25736 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-25736?
Check the references section above for vendor advisories and patch information. Affected products include: Kubernetes Kubernetes, Microsoft Windows.