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Tool Directory

CVE-2025-21420

HighPublished

Windows Disk Cleanup Tool Elevation of Privilege Vulnerability

Published: Feb 11, 2025
Updated: Feb 13, 2026
Assigning CNA: microsoft
Evidence observed: Aug 8, 2026

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

3.7%

Low · next 30 days

Percentile: 89.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Windows Disk Cleanup Tool Elevation of Privilege Vulnerability

Sources

CVE-2025-21420_POCPoC
Proof of Concept CVE-2025-21420 (Windows Disk Cleanup Tool EoP)
CVE-2025-21420-PoCPoC
We found a way to DLL sideload with cleanmgr.exe

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