CVE-2025-64715: cilium Access Control Flaw — Fix

Description

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Prior to versions 1.16.17, 1.17.10, and 1.18.4, CiliumNetworkPolicys which use egress.toGroups.aws.securityGroupsIds to reference AWS security group IDs that do not exist or are not attached to any network interface may unintentionally allow broader outbound access than intended by the policy authors. In such cases, the toCIDRset section of the derived policy is not generated, which means outbound traffic may be permitted to more destinations than originally intended. This issue has been patched in versions 1.16.17, 1.17.10, and 1.18.4. There are no workarounds for this issue.

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CVSS v3.1 Score

4.0

MEDIUM

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

Weakness Type (CWE)

CWE-284 CWE-284

Affected Products

Vendor	Product	Versions
cilium	cilium	< 1.16.17
cilium	cilium	1.17.0 — 1.17.10
cilium	cilium	1.18.0 — 1.18.4

References

Advisories & Patches

https://github.com/cilium/cilium/commit/a385856b59c8289cc7273fa3a3062bbf0ef96c97 https://github.com/cilium/cilium/security/advisories/GHSA-38pp-6gcp-rqvm

Other References

https://github.com/cilium/cilium/releases/tag/v1.16.17 https://github.com/cilium/cilium/releases/tag/v1.17.10 https://github.com/cilium/cilium/releases/tag/v1.18.4

Frequently Asked Questions

What is CVE-2025-64715? +

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Prior to versions 1.16.17, 1.17.10, and 1.18.4, CiliumNetworkPolicys which use egress.toGroups.aws.securityGroupsIds to reference AWS security group IDs that do not exist or are not attached to any network interface may unintentionally allow broader outbound access than intended by the policy authors. In such cases, the toCIDRset section of the derived policy is not generated, which means outbound traffic may be permitted to more destinations than originally intended. This issue has been patched in versions 1.16.17, 1.17.10, and 1.18.4. There are no workarounds for this issue. It has a CVSS v3.1 base score of 4.0 (MEDIUM).

How severe is CVE-2025-64715? +

CVE-2025-64715 has a CVSS v3.1 score of 4.0 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-64715? +

CVE-2025-64715 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-2025-64715? +

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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