---
id: CVE-2025-62221
title: >-
  Use after free in Windows Cloud Files Mini Filter Driver allows an authorized
  attacker to elevate privileges locally.
summary: >-
  Use after free in Windows Cloud Files Mini Filter Driver allows an authorized
  attacker to elevate privileges locally.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-416
vendor: microsoft
product: windows_10_1809
affected:
  - windows_10_1809 < 10.0.17763.8146
  - windows_10_21h2 < 10.0.19044.6691
  - windows_10_22h2 < 10.0.19045.6691
  - windows_11_23h2 < 10.0.22631.6345
  - windows_11_24h2 < 10.0.26100.7392
  - windows_11_25h2 < 10.0.26200.7392
  - windows_server_2019 < 10.0.17763.8146
  - windows_server_2022 < 10.0.20348.4467
  - windows_server_2022_23h2 < 10.0.25398.2025
  - windows_server_2025 < 10.0.26100.7392
patched:
  - windows_10_1809 10.0.17763.8146
  - windows_10_21h2 10.0.19044.6691
  - windows_10_22h2 10.0.19045.6691
  - windows_11_23h2 10.0.22631.6345
  - windows_11_24h2 10.0.26100.7392
  - windows_11_25h2 10.0.26200.7392
  - windows_server_2019 10.0.17763.8146
  - windows_server_2022 10.0.20348.4467
  - windows_server_2022_23h2 10.0.25398.2025
  - windows_server_2025 10.0.26100.7392
published: '2025-12-09'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T23:10:00.463'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-62221'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62221'
    label: secure@microsoft.com
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-62221
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - kev
  - in-the-wild
  - exploit-available
epss: 0.02505
epssPercentile: 0.84069
kev: true
kevDateAdded: '2025-12-09'
kevDueDate: '2025-12-30'
kevRansomware: false
exploited: true
exploits:
  github: 1
  githubRepos:
    - >-
      https://github.com/Teodor1231241/DEMO-Proof-of-Concept-Temporal-Memory-Inconsistency-in-cldflt.sys-CVE-2025-62221
  checkedAt: '2026-09-25T23:21:52.274Z'
exploitAvailable: true
zeroDay: true
ingestedAt: '2026-09-25T23:21:16.903Z'
---

## Overview

Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.

## Affected

- `windows_10_1809 < 10.0.17763.8146`
- `windows_10_21h2 < 10.0.19044.6691`
- `windows_10_22h2 < 10.0.19045.6691`
- `windows_11_23h2 < 10.0.22631.6345`
- `windows_11_24h2 < 10.0.26100.7392`
- `windows_11_25h2 < 10.0.26200.7392`
- `windows_server_2019 < 10.0.17763.8146`
- `windows_server_2022 < 10.0.20348.4467`
- `windows_server_2022_23h2 < 10.0.25398.2025`
- `windows_server_2025 < 10.0.26100.7392`

## Remediation

Upgrade past the affected range:

- `windows_10_1809 10.0.17763.8146`
- `windows_10_21h2 10.0.19044.6691`
- `windows_10_22h2 10.0.19045.6691`
- `windows_11_23h2 10.0.22631.6345`
- `windows_11_24h2 10.0.26100.7392`
- `windows_11_25h2 10.0.26200.7392`
- `windows_server_2019 10.0.17763.8146`
- `windows_server_2022 10.0.20348.4467`
- `windows_server_2022_23h2 10.0.25398.2025`
- `windows_server_2025 10.0.26100.7392`