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CVE-2021-25736— Windows kube-proxy LoadBalancer contention

Quick assessment

Affected
Kubernetes Kubernetes
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kubernetes SIGs kube-proxy是Kubernetes SIGs开源的一个应用软件。一个网络代理。 Kubernetes SIGs kube-proxy 存在安全漏洞，该漏洞源于程序发送的数据包可能会被错误路由并到达其它地方。

CVSS 5.8 · Medium EPSS 0.92% · P59

Possible ATT&CK Techniques 1 AI

T1090.001 · Internal Proxy
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I. Basic Information for CVE-2021-25736

Vulnerability Information
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Vulnerability Title
Windows kube-proxy LoadBalancer contention
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Kubernetes SIGs kube-proxy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubernetes SIGs kube-proxy是Kubernetes SIGs开源的一个应用软件。一个网络代理。 Kubernetes SIGs kube-proxy 存在安全漏洞，该漏洞源于程序发送的数据包可能会被错误路由并到达其它地方。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Kubernetes Kubernetes 0 ~ v1.20.5 -

II. Public POCs for CVE-2021-25736

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III. Intelligence Information for CVE-2021-25736

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Patches & Fixes for CVE-2021-25736 (1)

Vendor Advisories for CVE-2021-25736 (1)

Other References for CVE-2021-25736 (1)

IV. Related Vulnerabilities

Same product: Kubernetes
Same vendor: Kubernetes

V. Comments for CVE-2021-25736

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