CVE-2025-27489: Azure Local Elevation of Privilege Vulnerability

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-04-08 · updated 2026-08-10
Weakness: CWE-20

Description

Improper input validation in Azure Local allows an authorized attacker to elevate privileges locally.

Affected products

Microsoft Azure Stack Hci 22H2: before 10.0.20348.3328 — fixed in 10.0.20348.3328
Microsoft Azure Stack Hci 23H2: before 10.0.25398.1486 — fixed in 10.0.25398.1486
Microsoft Azure Stack HCI OS: from 10.0.25398.0 before 10.0.25398.1486 — fixed in 10.0.25398.1486
Microsoft Azure Stack OS HCI: from 10.0.20349.0 before 10.0.20348.3328 — fixed in 10.0.20348.3328

How to fix

Upgrade to a fixed version: Microsoft Azure Stack Hci 22H2 10.0.20348.3328; Microsoft Azure Stack Hci 23H2 10.0.25398.1486; Microsoft Azure Stack HCI OS 10.0.25398.1486; Microsoft Azure Stack OS HCI 10.0.20348.3328. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-27489

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