Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2021-25736

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
30/10/2023
Last modified:
12/06/2025

Description

Kube-proxy<br /> on Windows can unintentionally forward traffic to local processes <br /> listening on the same port (“spec.ports[*].port”) as a LoadBalancer <br /> Service when the LoadBalancer controller<br /> does not set the “status.loadBalancer.ingress[].ip” field. Clusters <br /> where the LoadBalancer controller sets the <br /> “status.loadBalancer.ingress[].ip” field are unaffected.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N CVSS v3.1 Severity and Metrics:

Base Score: 5.80 MEDIUM
Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): High
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): High
Integrity (I): None
Availability (A): None

Base Score 3.x
5.80
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:* 1.18.0 (including) 1.18.18 (excluding)
cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:* 1.19.0 (including) 1.19.10 (excluding)
cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:* 1.20.0 (including) 1.20.6 (excluding)
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools