CVE-2025-27489

Local privilege escalation via improper input validation

Published Apr 8, 2025 · Updated Aug 10, 2026

Improper input validation in Microsoft Azure Stack HCI OS allows local users with low privileges to elevate privileges locally. Microsoft has not disclosed the affected component, the rejected input, or the validation operation that fails. The flaw requires local low-privilege access; Microsoft has not specified the privilege level gained or the operations it enables.

CVSS severity7.8
High
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Microsoft Azure Stack HCI OS allows local users with low privileges to elevate privileges locally. Microsoft has not disclosed the affected component, the rejected input, or the validation operation that fails. The flaw requires local low-privilege access; Microsoft has not specified the privilege level gained or the operations it enables.

The record

CVE
CVE-2025-27489
Published
Apr 8, 2025
Updated
Aug 10, 2026
Vendor
Microsoft
Product
Azure Stack HCI OS
Classifications
CWE-20, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record 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=10.0.20349.0 <10.0.20348.3328
  2. Affected versionversion=10.0.25398.0 <10.0.25398.1486

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Azure Stack HCI OSversion=10.0.20349.0 <10.0.20348.3328; version=10.0.25398.0 <10.0.25398.1486

Published CVSS scores

7.8Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1068Exploitation for Privilege Escalation

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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