CVE-2025-30163: cilium Auth Bypass — Fix

Description

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Node based network policies (`fromNodes` and `toNodes`) will incorrectly permit traffic to/from non-node endpoints that share the labels specified in `fromNodes` and `toNodes` sections of network policies. Node based network policy is disabled by default in Cilium. This issue affects: Cilium v1.16 between v1.16.0 and v1.16.7 inclusive and v1.17 between v1.17.0 and v1.17.1 inclusive. This issue is fixed in Cilium v1.16.8 and v1.17.2. Users can work around this issue by ensuring that the labels used in `fromNodes` and `toNodes` fields are used exclusively by nodes and not by other endpoints.

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CVSS v3.1 Score

3.4

LOW

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

Weakness Type (CWE)

CWE-863 Incorrect Authorization

Affected Products

Vendor	Product	Versions
cilium	cilium	1.16.0 — 1.16.8
cilium	cilium	1.17.0 — 1.17.2

References

Advisories & Patches

https://github.com/cilium/cilium/pull/36657 https://github.com/cilium/cilium/security/advisories/GHSA-c6pf-2v8j-96mc

Other References

https://docs.cilium.io/en/stable/security/policy/language/#node-based

Frequently Asked Questions

What is CVE-2025-30163? +

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Node based network policies (`fromNodes` and `toNodes`) will incorrectly permit traffic to/from non-node endpoints that share the labels specified in `fromNodes` and `toNodes` sections of network policies. Node based network policy is disabled by default in Cilium. This issue affects: Cilium v1.16 between v1.16.0 and v1.16.7 inclusive and v1.17 between v1.17.0 and v1.17.1 inclusive. This issue is fixed in Cilium v1.16.8 and v1.17.2. Users can work around this issue by ensuring that the labels used in `fromNodes` and `toNodes` fields are used exclusively by nodes and not by other endpoints. It has a CVSS v3.1 base score of 3.4 (LOW).

How severe is CVE-2025-30163? +

CVE-2025-30163 has a CVSS v3.1 score of 3.4 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

What products are affected by CVE-2025-30163? +

CVE-2025-30163 affects products from cilium, specifically: cilium. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-30163? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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