How severe is CVE-2026-21228?

CVE-2026-21228 has a CVSS 3.x base score of 8.1, rated high 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-2026-21228 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21228?

CVE-2026-21228 affects Microsoft Azure Local. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21228?

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

Does CVE-2026-21228 have an EU (EUVD) identifier?

Yes. CVE-2026-21228 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7310.

When was CVE-2026-21228 published?

CVE-2026-21228 was published on 2026-02-10 and last updated on 2026-06-17.

CVE-2026-21228

CVE-2026-21228 is a high-severity vulnerability in Microsoft Azure Local with a CVSS 3.x base score of 8.1. 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-295.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7310
Weakness: CWE-295
Affected product: Microsoft Azure Local
Published: 2026-02-10
Last modified: 2026-06-17

Description

Improper certificate validation in Azure Local allows an unauthorized attacker to execute code over a network.

Frequently asked questions

What is CVE-2026-21228?: Improper certificate validation in Azure Local allows an unauthorized attacker to execute code over a network.
How severe is CVE-2026-21228?: CVE-2026-21228 has a CVSS 3.x base score of 8.1, rated high 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-2026-21228 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21228?: CVE-2026-21228 affects Microsoft Azure Local. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21228?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-21228 have an EU (EUVD) identifier?: Yes. CVE-2026-21228 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7310.
When was CVE-2026-21228 published?: CVE-2026-21228 was published on 2026-02-10 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21228

Affected products (1)

cpe:2.3:a:microsoft:azure_local:*:*:*:*:*:*:*:*

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