CVE-2024-42488Network attack vector

Host Firewall bypass via stale node labels

Published Aug 15, 2024 · Updated Aug 19, 2024

A race condition in Cilium before 1.14.14 and 1.15.0 through 1.15.7 allows remote attackers to bypass Host Firewall policy. During agent startup, the node-label observer advances its old-label state after a host-endpoint update fails, causing every later update to fail its precondition. The race requires the Kubernetes node watcher to initialize before the host endpoint; stale labels then prevent label-selected clusterwide policies from applying.

CVSS severity6.8
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in Cilium before 1.14.14 and 1.15.0 through 1.15.7 allows remote attackers to bypass Host Firewall policy. During agent startup, the node-label observer advances its old-label state after a host-endpoint update fails, causing every later update to fail its precondition. The race requires the Kubernetes node watcher to initialize before the host endpoint; stale labels then prevent label-selected clusterwide policies from applying.

The record

CVE
CVE-2024-42488
Published
Aug 15, 2024
Updated
Aug 19, 2024
Vendor
Cilium
Product
Cilium
Classifications
CWE-362, T1562.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 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=< 1.14.14
  2. Affected versionversion=>= 1.15.0, < 1.15.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cilium · Ciliumversion=< 1.14.14; version=>= 1.15.0, < 1.15.8

Published CVSS scores

6.8NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
6.8GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1562.004Disable or Modify System Firewall

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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