Vulnerability Report

CVE-2021-25736

Title: Kubernetes

Other

Proof Of Concept

No public PoC currently indexed for CVE-2021-25736.

CWE Category CWE-114
Published Date Oct 30, 2023
Modified Date Jun 12, 2025
Exploit Status Not Found
Score 5.8 CVSS v3.1
Exploit Probability (EPSS)
0.09%

Vulnerability Summary

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. Clusters where the LoadBalancer controller sets the “status.loadBalancer.ingress[].ip” field are unaffected.

Impacted Vendors

K
kubernetes 1
J
jenkins 1

Reference Links

https://github.com/kubernetes/kubernetes/pull/99958 https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ https://security.netapp.com/advisory/ntap-20231221-0003/ https://github.com/kubernetes/kubernetes/pull/99958 https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ https://security.netapp.com/advisory/ntap-20231221-0003/
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
5.8
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
6.3
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-25736 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity HIGH
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N

Affected Stack

No specific products linked.