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CVE-2021-25736 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:6.3 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

CNA: [email protected]CVSS-B:5.8 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/kubernetes/kubernetes/pull/99958	CVE	Third Party Advisory
https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ	CVE	Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20231221-0003/	CVE
https://github.com/kubernetes/kubernetes/pull/99958	[email protected]	Third Party Advisory
https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ	[email protected]	Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20231221-0003/	[email protected]

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
NVD-CWE-noinfo	Insufficient Information to Classify Weakness	[email protected]
CWE-114	Process Control	CISA-ADP

Affected Products

Product	Versions
kubernetes kubernetes	>= 1.18.0, < 1.18.18 >= 1.19.0, < 1.19.10 >= 1.20.0, < 1.20.6
CPE cpe:2.3:a:kubernetes:kubernetes:::::::: Remediation No remediation found in references.
microsoft windows	All versions
CPE cpe:2.3:o:microsoft:windows:-:::::::* Remediation No remediation found in references.

Change History

8 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Jun 12, 2025	CVE Modified	CISA-ADP
Feb 13, 2025	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Dec 21, 2023	CVE Modified	[email protected]
Nov 16, 2023	Initial Analysis	[email protected]