Auth bypass in Cilium
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.4 (Low). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.002 (9.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Cilium — versions >= 1.16.0, < 1.16.8, >= 1.17.0, < 1.17.2
Weakness classification (CWE)
References
- github.com/cilium/cilium/security/advisories/GHSA-c6pf-2v8j-96mc (Patch, Third Party Advisory, Mitigation)
- github.com/cilium/cilium/pull/36657 (Patch)
- docs.cilium.io/en/stable/security/policy/language/ (Product)
Frequently asked questions
- What is CVE-2025-30163?
- CVE-2025-30163 is a low-severity vulnerability in Cilium, classified under Incorrect Authorization. CVSS score: 3.4/10. Published 2025-03-24.
- How severe is CVE-2025-30163?
- Low severity. CVSS v3 base score is 3.4 out of 10.