---
id: "CVE-2025-62221"
kind: "vulnerability"
aliases: ["CVE-2025-62221"]
title: "Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally"
severity: "high"
cvss: 7.8
epss: null
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Microsoft Windows", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows 10 1809", "fixed": ["10.0.17763.8146"], "affected": "< 10.0.17763.8146", "ecosystem": "vendor"}, {"name": "microsoft windows 10 21h2", "fixed": ["10.0.19044.6691"], "affected": "< 10.0.19044.6691", "ecosystem": "vendor"}, {"name": "microsoft windows 10 22h2", "fixed": ["10.0.19045.6691"], "affected": "< 10.0.19045.6691", "ecosystem": "vendor"}, {"name": "microsoft windows 11 23h2", "fixed": ["10.0.22631.6345"], "affected": "< 10.0.22631.6345", "ecosystem": "vendor"}, {"name": "microsoft windows 11 24h2", "fixed": ["10.0.26100.7392"], "affected": "< 10.0.26100.7392", "ecosystem": "vendor"}, {"name": "microsoft windows 11 25h2", "fixed": ["10.0.26200.7392"], "affected": "< 10.0.26200.7392", "ecosystem": "vendor"}, {"name": "microsoft windows server 2019", "fixed": ["10.0.17763.8146"], "affected": "< 10.0.17763.8146", "ecosystem": "vendor"}, {"name": "microsoft windows server 2022", "fixed": ["10.0.20348.4467"], "affected": "< 10.0.20348.4467", "ecosystem": "vendor"}, {"name": "microsoft windows server 2022 23h2", "fixed": ["10.0.25398.2025"], "affected": "< 10.0.25398.2025", "ecosystem": "vendor"}, {"name": "microsoft windows server 2025", "fixed": ["10.0.26100.7392"], "affected": "< 10.0.26100.7392", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "infrastructure", "self-hosted", "windows"]
not_affected_if: ["unknown"]
published_at: "2025-12-09T00:00:00+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T23:44:51+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-62221", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-62221", "first_seen_at": "2026-10-23T23:44:51+00:00"}]
---

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

A use-after-free bug in the Windows Cloud Files Mini Filter Driver lets an authorized local user corrupt memory and gain higher privileges. CISA lists it as actively exploited in the wild.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Microsoft Windows affected ? fixed ?
- vendor:microsoft windows 10 1809 affected < 10.0.17763.8146 fixed 10.0.17763.8146
- vendor:microsoft windows 10 21h2 affected < 10.0.19044.6691 fixed 10.0.19044.6691
- vendor:microsoft windows 10 22h2 affected < 10.0.19045.6691 fixed 10.0.19045.6691
- vendor:microsoft windows 11 23h2 affected < 10.0.22631.6345 fixed 10.0.22631.6345
- vendor:microsoft windows 11 24h2 affected < 10.0.26100.7392 fixed 10.0.26100.7392
- vendor:microsoft windows 11 25h2 affected < 10.0.26200.7392 fixed 10.0.26200.7392
- vendor:microsoft windows server 2019 affected < 10.0.17763.8146 fixed 10.0.17763.8146
- vendor:microsoft windows server 2022 affected < 10.0.20348.4467 fixed 10.0.20348.4467
- vendor:microsoft windows server 2022 23h2 affected < 10.0.25398.2025 fixed 10.0.25398.2025
- vendor:microsoft windows server 2025 affected < 10.0.26100.7392 fixed 10.0.26100.7392

## Fix

Apply the Microsoft security update for CVE-2025-62221 per vendor instructions; the sources do not name the patched build.

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-62221
- 2026-10-23T23:44:51+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2025-62221

## From the sources

Microsoft Windows Cloud Files Mini Filter Driver contains a use after free vulnerability that can allow an authorized attacker to elevate privileges locally.

CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_