BaseFortify

Publication date: 2025-11-29

Last updated on: 2025-12-04

Assigner: GitHub, Inc.

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-11-29

Last Modified

2025-12-04

Generated

2026-07-06

AI Q&A

2025-11-29

EPSS Evaluated

2026-07-04

NVD

CVE-2025-64715

Affected Vendors & Products

Vendor	Product	Version / Range
cilium	cilium	to 1.16.17 (exc)
cilium	cilium	From 1.17.0 (inc) to 1.17.10 (exc)
cilium	cilium	From 1.18.0 (inc) to 1.18.4 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CWE-NVD-CWE-noinfo

Attack-Flow Graph

Executive Summary

This vulnerability in Cilium occurs when CiliumNetworkPolicys use egress.toGroups.aws.securityGroupsIds to reference AWS security group IDs that either do not exist or are not attached to any network interface. In such cases, the policy fails to generate the toCIDRset section, which results in outbound traffic being allowed to more destinations than intended by the policy authors. This means that the intended restrictions on outbound network access may be bypassed, potentially allowing broader outbound access.

Impact Analysis

The impact of this vulnerability is that outbound network traffic may be permitted to more destinations than originally intended by the policy authors. This could lead to unintended exposure of network resources or data, as the security policies meant to restrict outbound access are not properly enforced. This may increase the risk of data leakage or unauthorized communication from affected systems.

Mitigation Strategies

Upgrade Cilium to version 1.16.17, 1.17.10, or 1.18.4 or later, as these versions contain the patch for this vulnerability. There are no workarounds available.

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