CVE-2021-25741— Symlink Exchange Can Allow Host Filesystem Access
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I. Basic Information for CVE-2021-25741
Vulnerability Information
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Vulnerability Title
Symlink Exchange Can Allow Host Filesystem Access
Source: NVD (National Vulnerability Database)
Vulnerability Description
A security issue was discovered in Kubernetes where a user may be able to create a container with subpath volume mounts to access files & directories outside of the volume, including on the host filesystem.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Kubernetes 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubernetes是美国Linux基金会的一套开源的Docker容器集群管理系统。该系统为容器化的应用提供资源调度、部署运行、服务发现和扩容缩容等功能。 kubernetes 存在安全漏洞，攻击者可利用该漏洞通过创建具有精心编制的子路径卷装载的pod，以访问卷外的文件和目录，包括主机节点的文件系统上的文件和目录
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 ~ 1.19.14 | - |
II. Public POCs for CVE-2021-25741
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | Exploit for CVE-2021-25741 vulnerability | https://github.com/Betep0k/CVE-2021-25741 | POC Details |
| 2 | fork on Betep0k/CVE-2021-25741/fork whose images is useless and test on metarget | https://github.com/cdxiaodong/CVE-2021-25741 | POC Details |
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- https://security.netapp.com/advisory/ntap-20211008-0006/x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2021-25741
Same Patch Batch · Kubernetes · 2021-09-20 · 3 CVEs total
| CVE-2020-8561 | 4.1 MEDIUM | Webhook redirect in kube-apiserver |
| CVE-2021-25740 | 3.1 LOW | Holes in EndpointSlice Validation Enable Host Network Hijack |
IV. Related Vulnerabilities
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Incorrect permissions on Windows containers logs - CVE-2024-3177
Bypassing mountable secrets policy imposed by the ServiceAcc
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-2021-25741
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