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Vulnerability · Published Nov 29, 2025 · Assigned by GitHub_M

CVE-2025-64715Cilium with misconfigured toGroups in policies can lead to unrestricted egress traffic

Medium 4.0

In plain English

A medium-severity improper access control in cilium from cilium. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.0Medium
Exploit odds (30 days)0.2%top 92.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/cilium/cilium1.18.4GHSA-38pp-6gcp-rqvm
Gogithub.com/cilium/cilium1.17.10GHSA-38pp-6gcp-rqvm
Gogithub.com/cilium/cilium1.16.17GHSA-38pp-6gcp-rqvm
Gogithub.com/cilium/cilium1.16.17, 1.17.10, 1.18.4GO-2025-4167

Affected products (as reported)

VendorProductVersions
cilium cilium < 1.16.17>= 1.17.0, < 1.17.10>= 1.18.0, < 1.18.4

Weakness: CWE-284 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References