CVE-2025-21416Network attack vector

Authenticated privilege escalation via missing authorization

Published Apr 30, 2025 · Updated Aug 10, 2026

Missing authorization in Microsoft Azure Virtual Desktop allows remote authenticated users to elevate privileges over a network. The service omits an authorization check for an undisclosed privileged operation, but Microsoft has not identified the affected component or request. Exploitation requires an existing low-privileged account and no user interaction; success crosses a security boundary and grants elevated access.

CVSS severity8.5
High
EPSS probability0.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Microsoft Azure Virtual Desktop allows remote authenticated users to elevate privileges over a network. The service omits an authorization check for an undisclosed privileged operation, but Microsoft has not identified the affected component or request. Exploitation requires an existing low-privileged account and no user interaction; success crosses a security boundary and grants elevated access.

The record

CVE
CVE-2025-21416
Published
Apr 30, 2025
Updated
Aug 10, 2026
Vendor
Microsoft
Product
Azure Virtual Desktop
Classifications
CWE-862, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 30, 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=-

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Azure Virtual Desktopversion=-

Published CVSS scores

8.5Microsoft CorporationCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
8.8National Institute of Standards and TechnologyCVSS:3.1/AV:N/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
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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