TI-2023-17078 Aliases CVE-2023-34242 GHSA-r7wr-4w5q-55m6

Cilium vulnerable to information leakage via incorrect ReferenceGrant handling

LOW 24CWE-200Published 2023-06-15 · Updated 2024-12-11

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: Low · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-200.

Summary

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Prior to version 1.13.4, when Gateway API is enabled in Cilium, the absence of a check on the namespace in which a ReferenceGrant is created could result in Cilium unintentionally gaining visibility of secrets (including certificates) and services across namespaces. An attacker on an affected cluster can leverage this issue to use cluster secrets that should not be visible to them, or communicate with services that they should not have access to. Gateway API functionality is disabled by default. This vulnerability is fixed in Cilium release 1.13.4. As a workaround, restrict the creation of `ReferenceGrant` resources to admin users by using Kubernetes RBAC.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00305 23rd percentileScored 2026-11-07

Fix Fixed cilium (cilium): 1.13.4github.com/cilium/cilium (Go): 1.13.4

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 1.13.4	1.13.4	Patch available	CNA
—	github.com/cilium/cilium (Go)	1.13.0 to before 1.13.4	1.13.4	Patch available	GHSA-r7wr-4w5q-55m6

cilium Vendorcilium Affected before 1.13.4 Fixed in 1.13.4 Patch available CNA
github.com/cilium/cilium (Go) Vendor— Affected 1.13.0 to before 1.13.4 Fixed in 1.13.4 Patch available GHSA-r7wr-4w5q-55m6

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:cilium:cilium::::::::	before 1.13.4	Vulnerable	cilium

cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:* Versions before 1.13.4 Vulnerable ·cilium

Remediation

Fix · CNA cilium (cilium) Fixed in 1.13.4
Fix · GHSA-r7wr-4w5q-55m6 github.com/cilium/cilium (Go) Fixed in 1.13.4 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2023-34242
2026-10-03 Alias added: GHSA-r7wr-4w5q-55m6

References

Advisory 2

Other 2

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