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CVE-2023-34242

Cilium vulnerable to information leakage via incorrect ReferenceGrant handling

MEDIUM
5.3
CVSS Score
Published: June 15, 2023 at 07:07 PM UTC
Updated: June 17, 2026 at 06:03 AM UTC
1 product affected across 1 vendorCilium

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Cilium· Cilium
95%
v < 1.13.4
Affected range stops below 1.13.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

x_refsource_MISCRelease Notes
Source: [email protected]
https://github.com/cilium/cilium/releases/tag/v1.13.4
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/cilium/cilium/security/advisories/GHSA-r7wr-4w5q-55m6

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-200

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