CVE-2023-34242

3.4 LOW 0.3% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited from the same network segment with an admin-level account. Limited direct impact.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2023-06-15 20:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 06:03 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.3% in the next 30 days (EPSS).
Severity: 3.4 LOW (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2023-06-15 20:15 UTC
Last modified: 2026-06-17 06:03 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Weakness: CWE-200 · Information exposure
Record status: Modified

Affected

Cilium < 1.13.4

Attack profile CVSS 3.1 · 3.4

Attack vector: Adjacent network
Complexity: Low
Privileges needed: High
User interaction: None
Scope: Changed
Confidentiality: Low
Integrity: None
Availability: None

Raw vector

CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N

Is it in your code?

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Read https://cve-list.com/agent/cve/CVE-2023-34242.md and follow it. Check whether this project is affected by CVE-2023-34242. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record