CVE-2023-34242

Cross-namespace access via unchecked ReferenceGrant namespace

Published Jun 15, 2023 · Updated Dec 11, 2024

Information disclosure in Cilium before 1.13.4 allows remote authenticated users to access cross-namespace secrets and services. Gateway API ReferenceGrant processing fails to verify the grant object's namespace before admitting cross-namespace references. The attacker needs permission to create ReferenceGrant resources in an affected cluster, and Gateway API must be enabled; it is disabled by default.

CVSS severity3.4
Low
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Cilium before 1.13.4 allows remote authenticated users to access cross-namespace secrets and services. Gateway API ReferenceGrant processing fails to verify the grant object's namespace before admitting cross-namespace references. The attacker needs permission to create ReferenceGrant resources in an affected cluster, and Gateway API must be enabled; it is disabled by default.

The record

CVE
CVE-2023-34242
Published
Jun 15, 2023
Updated
Dec 11, 2024
Vendor
Cilium
Product
Cilium
Classifications
CWE-200, T1552.007
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 11, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.13.4

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

Cilium · Ciliumversion=< 1.13.4

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.4GitHub, Inc.CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1552.007Unsecured Credentials: Container API

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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