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CVE-2025-23047— Cilium vulnerable to information leakage via insecure default Hubble UI CORS header

Quick assessment

Affected
cilium cilium
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.

Cilium是Cilium开源的一个开源软件。用于提供和透明地保护应用程序工作负载（如应用程序容器或进程）之间的网络连接和负载平衡。 Cilium存在信息泄露漏洞。攻击者利用该漏洞可以获取敏感信息。

CVSS 6.5 · Medium EPSS 0.50% · P41
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I. Basic Information for CVE-2025-23047

Vulnerability Information
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Vulnerability Title
Cilium vulnerable to information leakage via insecure default Hubble UI CORS header
Source: CVE Program / CVE List V5
Vulnerability Description
Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An insecure default `Access-Control-Allow-Origin` header value could lead to sensitive data exposure for users of Cilium versions 1.14.0 through 1.14.7, 1.15.0 through 1.15.11, and 1.16.0 through 1.16.4 who deploy Hubble UI using either Cilium CLI or via the Cilium Helm chart. A user with access to a Hubble UI instance affected by this issue could leak configuration details about the Kubernetes cluster which Hubble UI is monitoring, including node names, IP addresses, and other metadata about workloads and the cluster networking configuration. In order for this vulnerability to be exploited, a victim would have to first visit a malicious page. This issue is fixed in Cilium v1.14.18, v1.15.12, and v1.16.5. As a workaround, users who deploy Hubble UI using the Cilium Helm chart directly can remove the CORS headers from the Helm template as shown in the patch from commit a3489f190ba6e87b5336ee685fb6c80b1270d06d.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Cilium 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cilium是Cilium开源的一个开源软件。用于提供和透明地保护应用程序工作负载（如应用程序容器或进程）之间的网络连接和负载平衡。 Cilium存在信息泄露漏洞。攻击者利用该漏洞可以获取敏感信息。
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
cilium cilium >= 1.14.0, < 1.14.18 -

II. Public POCs for CVE-2025-23047

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III. Intelligence Information for CVE-2025-23047

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Patches & Fixes for CVE-2025-23047 (1)

Vendor Advisories for CVE-2025-23047 (1)

IV. Related Vulnerabilities

Same product: cilium
Same vendor: cilium
Same weakness: CWE-200

V. Comments for CVE-2025-23047

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