CVE-2021-25736

MEDIUM EPSS 55.4%
Published Oct 30, 20232y ago · Modified Jun 17, 20261w ago
6.3 CVSS 3.1
Medium
Find Similar
Published Oct 30, 2023 2y ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
6.3
Exploitability
1.8
Impact
4.0
Vector string
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Attack Vector Network
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Changed
Confidentiality High
Integrity None
Availability None

Threat Intelligence

EPSS Exploit Probability
55.4% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-114

Affected Products 4

VendorProductVersionRange
kuberneteskubernetes*≥1.18.0  –  <1.18.18
kuberneteskubernetes*≥1.19.0  –  <1.19.10
kuberneteskubernetes*≥1.20.0  –  <1.20.6
microsoftwindows*any

References 3

  • github.com https://github.com/kubernetes/kubernetes/pull/99958
    Third Party Advisory
  • groups.google.com https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ
    Mailing ListThird Party Advisory
  • security.netapp.com https://security.netapp.com/advisory/ntap-20231221-0003/

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.