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CVE-2021-25735— Validating Admission Webhook does not observe some previous fields

Quick assessment

Affected
Kubernetes Kubernetes
Exploitation
Public or AI PoC available; prioritize validation
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-apiserver是Kubernetes SIGs开源的一个应用软件。验证并配置api对象的数据，这些对象包括容器，服务，复制控制器等。 Kubernetes SIGs kube-apiserver 存在安全漏洞，该漏洞允许节点更新绕过一个验证接纳的Webhook。

CVSS 6.5 · Medium EPSS 5.38% · P92
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I. Basic Information for CVE-2021-25735

Vulnerability Information
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Vulnerability Title
Validating Admission Webhook does not observe some previous fields
Source: CVE Program / CVE List V5
Vulnerability Description
A security issue was discovered in kube-apiserver that could allow node updates to bypass a Validating Admission Webhook. Clusters are only affected by this vulnerability if they run a Validating Admission Webhook for Nodes that denies admission based at least partially on the old state of the Node object. Validating Admission Webhook does not observe some previous fields.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不完整的内部状态区分
Source: CVE Program / CVE List V5
Vulnerability Title
Kubernetes SIGs kube-apiserver 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubernetes SIGs kube-apiserver是Kubernetes SIGs开源的一个应用软件。验证并配置api对象的数据，这些对象包括容器，服务，复制控制器等。 Kubernetes SIGs kube-apiserver 存在安全漏洞，该漏洞允许节点更新绕过一个验证接纳的Webhook。
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 unspecified ~ 1.18.17 -

II. Public POCs for CVE-2021-25735

# POC Description Source Link Shenlong Link
1 Exploit CVE-2021-25735: Kubernetes Validating Admission Webhook Bypass https://github.com/darryk10/CVE-2021-25735 POC Details
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III. Intelligence Information for CVE-2021-25735

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Other References for CVE-2021-25735 (2)

IV. Related Vulnerabilities

Same product: Kubernetes
Same vendor: Kubernetes
Same weakness: CWE-372

V. Comments for CVE-2021-25735

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