TI-2025-40061 Aliases CVE-2025-64715 GHSA-38pp-6gcp-rqvm

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

LOW 24CWE-284Published 2025-11-29 · Updated 2025-12-01

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-284.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00184 8th percentileScored 2026-11-07

Fix Fixed cilium (cilium): 1.16.17, 1.17.10, 1.18.4github.com/cilium/cilium (Go): 1.18.4, 1.17.10, 1.16.17

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
cilium	cilium	before 1.16.17; 1.17.0 to before 1.17.10; 1.18.0 to before 1.18.4	1.16.17, 1.17.10, 1.18.4	Patch available	CNA
—	github.com/cilium/cilium (Go)	1.18.0 to before 1.18.4	1.18.4	Patch available	GHSA-38pp-6gcp-rqvm
—	github.com/cilium/cilium (Go)	1.17.0 to before 1.17.10	1.17.10	Patch available	GHSA-38pp-6gcp-rqvm
—	github.com/cilium/cilium (Go)	before 1.16.17	1.16.17	Patch available	GHSA-38pp-6gcp-rqvm

cilium Vendorcilium Affected before 1.16.17; 1.17.0 to before 1.17.10; 1.18.0 to before 1.18.4 Fixed in 1.16.17, 1.17.10, 1.18.4 Patch available CNA
github.com/cilium/cilium (Go) Vendor— Affected 1.18.0 to before 1.18.4 Fixed in 1.18.4 Patch available GHSA-38pp-6gcp-rqvm
github.com/cilium/cilium (Go) Vendor— Affected 1.17.0 to before 1.17.10 Fixed in 1.17.10 Patch available GHSA-38pp-6gcp-rqvm
github.com/cilium/cilium (Go) Vendor— Affected before 1.16.17 Fixed in 1.16.17 Patch available GHSA-38pp-6gcp-rqvm

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:cilium:cilium::::::::	before 1.16.17; 1.17.0 to before 1.17.10; 1.18.0 to before 1.18.4	Vulnerable	cilium

cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:* Versions before 1.16.17; 1.17.0 to before 1.17.10; 1.18.0 to before 1.18.4 Vulnerable ·cilium

Remediation

Fix · CNA cilium (cilium) Fixed in 1.16.17, 1.17.10, 1.18.4
Fix · GHSA-38pp-6gcp-rqvm github.com/cilium/cilium (Go) Fixed in 1.18.4 Advisory →
Fix · GHSA-38pp-6gcp-rqvm github.com/cilium/cilium (Go) Fixed in 1.17.10 Advisory →
Fix · GHSA-38pp-6gcp-rqvm github.com/cilium/cilium (Go) Fixed in 1.16.17 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2025-64715
2026-10-03 Alias added: GHSA-38pp-6gcp-rqvm

References

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2025-64715

Other 4

TI-2024-32092 CIDR deny policies may not take effect when a more narrow CIDR allow is present CVSS 3.1HIGH 8.7
TI-2023-12305 Cilium eBPF filters may be temporarily removed during agent restart CVSS 3.1CRITICAL 9.8
TI-2023-20486 Cilium NetworkPolicy bypass via pod labels CVSS 3.1CRITICAL 9.0
TI-2022-11721 Incorrect Default Permissions in Cilium CVSS 3.1HIGH 8.8
TI-2026-36600 Cilium: Sensitive information disclosure and cluster disruption via local Envoy admin socket access CVSS 3.1CRITICAL 9.2
TI-2026-40915 Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces CVSS 3.1HIGH 8.9

See all 34 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences