CVE-2021-25736

5.8 MEDIUM 0.9% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited over the network with an admin-level account. High risk of data exposure.
Exploit odds: 0.9% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2023-10-30 03:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:42 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.9% in the next 30 days (EPSS).
Severity: 5.8 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2023-10-30 03:15 UTC
Last modified: 2026-06-17 03:42 UTC
Exploit probability: 0.9% · EPSS, next 30 days
Weakness: CWE-114
Record status: Modified

Affected

Kubernetes < 1.18.18
Kubernetes < 1.19.10
Kubernetes < 1.20.6

Attack profile CVSS 3.1 · 5.8

Attack vector: Network
Complexity: High
Privileges needed: High
User interaction: None
Scope: Changed
Confidentiality: High
Integrity: None
Availability: None

Raw vector

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

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Fix and advisories

References

NVD record · CVE.org record