Cilium with misconfigured toGroups in policies can lead to unrestricted egress traffic

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-64715
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-11-29 01:16:01 UTC
Updated2026-10-19 13:10:00 UTC
DescriptionCilium 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: CWE-284 | NVD-CWE-noinfo | CWE-284 CWE-284: Improper Access Control

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
3.1[email protected]Secondary4MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED4MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Cilium Cilium All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cilium Cilium affected < 1.16.17 Not specified
CNA Cilium Cilium affected >= 1.17.0, < 1.17.10 Not specified
CNA Cilium Cilium affected >= 1.18.0, < 1.18.4 Not specified

References

ReferenceSourceLinkTags
github.com/cilium/cilium/commit/a385856b59c8289cc7273fa3a3062bbf0ef96c97 [email protected] github.com Patch
github.com/cilium/cilium/releases/tag/v1.18.4 [email protected] github.com Release Notes
github.com/cilium/cilium/releases/tag/v1.17.10 [email protected] github.com Release Notes
github.com/cilium/cilium/security/advisories/GHSA-38pp-6gcp-rqvm [email protected] github.com Patch, Vendor Advisory
github.com/cilium/cilium/releases/tag/v1.16.17 [email protected] github.com Release Notes
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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