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Cilium node based network policies may incorrectly allow workload traffic

Low severity GitHub Reviewed Published Mar 24, 2025 in cilium/cilium • Updated Mar 24, 2025

Package

gomod Ciliumgithub.com/cilium/cilium (Go)

Affected versions

>= 1.17.0, < 1.17.2

Patched versions

1.17.2
gomod github.com/cilium/cilium (Go)
>= 1.16.0, < 1.16.8
1.16.8

Description

Impact

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.

Patches

This issue was fixed by cilium/cilium#36657.

This issue affects:

  • Cilium v1.16 between v1.16.0 and v1.16.7 inclusive
  • Cilium v1.17 between v1.17.0 and v1.17.1 inclusive

This issue is fixed in:

  • Cilium v1.16.8
  • Cilium v1.17.2

Workarounds

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.

Acknowledgements

The Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to @oblazek for reporting and fixing this issue.

For more information

If you think you have found a vulnerability affecting Cilium, we strongly encourage you to report it to our security mailing list at [email protected]. This is a private mailing list for the Cilium security team, and your report will be treated as top priority. Please also address any comments or questions on this advisory to the same mailing list.

References

@ferozsalam ferozsalam published to cilium/cilium Mar 24, 2025
Published by the National Vulnerability Database Mar 24, 2025
Published to the GitHub Advisory Database Mar 24, 2025
Reviewed Mar 24, 2025
Last updated Mar 24, 2025

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Adjacent
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(6th percentile)

Weaknesses

CVE ID

CVE-2025-30163

GHSA ID

GHSA-c6pf-2v8j-96mc

Source code

Credits

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