CVE-2021-25742— Ingress-nginx custom snippets allows retrieval of ingress-nginx serviceaccount token and secrets across all namespaces
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I. Basic Information for CVE-2021-25742
Vulnerability Information
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Vulnerability Title
Ingress-nginx custom snippets allows retrieval of ingress-nginx serviceaccount token and secrets across all namespaces
Source: NVD (National Vulnerability Database)
Vulnerability Description
A security issue was discovered in ingress-nginx where a user that can create or update ingress objects can use the custom snippets feature to obtain all secrets in the cluster.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
ingress-nginx 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ingress-nginx是开源的Kubernetes 的入口控制器，使用NGINX作为反向代理和负载均衡器。 ingress-nginx 存在安全漏洞，该漏洞源于创建或更新 ingress 对象的用户可以使用自定义片段功能来获取集群中的所有机密。
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 ingress-nginx | unspecified ~ 0.49.0 | - |
II. Public POCs for CVE-2021-25742
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://github.com/kubernetes/ingress-nginx/issues/7837x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20211203-0001/x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2021-25742
IV. Related Vulnerabilities
Same vendor: Kubernetes
- CVE-2026-3864
CSI Driver for NFS path traversal via subDir may delete unin - CVE-2026-4342
ingress-nginx comment-based nginx configuration injection - CVE-2026-3288
ingress-nginx rewrite-target nginx configuration injection - CVE-2025-15566
ingress-nginx auth-proxy-set-headers nginx configuration inj - CVE-2026-24514
ingress-nginx Admission Controller denial of service
Same weakness: CWE-20
V. Comments for CVE-2021-25742
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