How severe is CVE-2024-21403?

CVE-2024-21403 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2024-21403 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-21403?

CVE-2024-21403 affects Microsoft Azure Kubernetes Service. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-21403?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2024-21403 have an EU (EUVD) identifier?

Yes. CVE-2024-21403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19113.

When was CVE-2024-21403 published?

CVE-2024-21403 was published on 2024-02-13 and last updated on 2026-06-17.

CVE-2024-21403

CVE-2024-21403 is a critical-severity vulnerability in Microsoft Azure Kubernetes Service with a CVSS 3.x base score of 9.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-552.

Key facts

Severity: Critical (CVSS 3.x base score 9.0)
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-19113
Weakness: CWE-552
Affected product: Microsoft Azure Kubernetes Service
Published: 2024-02-13
Last modified: 2026-06-17

Description

Microsoft Azure Kubernetes Service Confidential Container Elevation of Privilege Vulnerability

Frequently asked questions

What is CVE-2024-21403?: Microsoft Azure Kubernetes Service Confidential Container Elevation of Privilege Vulnerability
How severe is CVE-2024-21403?: CVE-2024-21403 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2024-21403 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-21403?: CVE-2024-21403 affects Microsoft Azure Kubernetes Service. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-21403?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2024-21403 have an EU (EUVD) identifier?: Yes. CVE-2024-21403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19113.
When was CVE-2024-21403 published?: CVE-2024-21403 was published on 2024-02-13 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21403

Affected products (1)

cpe:2.3:a:microsoft:azure_kubernetes_service:-:*:*:*:*:*:*:*

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