What is CVE-2025-21416?

CVE-2025-21416 is a high-severity vulnerability in Microsoft Azure Virtual Desktop, classified under Missing Authorization. CVSS score: 8.5/10. Published 2025-04-30.

How severe is CVE-2025-21416?

High severity. CVSS v3 base score is 8.5 out of 10.

Is CVE-2025-21416 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Microsoft Azure Virtual Desktop

CVE-2025-21416

Missing authorization in Azure Virtual Desktop allows an authorized attacker to elevate privileges over a network.

Vulnerability class: Broken Access Control

Published 2025-04-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (54.4th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-862 — Missing Authorization

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

Azure Virtual Desktop Elevation of Privilege Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-21416?: CVE-2025-21416 is a high-severity vulnerability in Microsoft Azure Virtual Desktop, classified under Missing Authorization. CVSS score: 8.5/10. Published 2025-04-30.
How severe is CVE-2025-21416?: High severity. CVSS v3 base score is 8.5 out of 10.
Is CVE-2025-21416 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.