CVE-2021-25736
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.
Does this matter?
Lower severity and a low EPSS score (0.92%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 6.3 MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
- EPSS
- 0.92% probability · 58th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-114
- Affected
- kubernetes/kubernetes
- Source
- jordan@liggitt.net
References
- https://github.com/kubernetes/kubernetes/pull/99958Third Party Advisory
- https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJMailing List, Third 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/O15LOazPAgAJMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20231221-0003/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.