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Known Exploited Vulnerability
7.8
HIGH CVSS 3.1
CVE-2025-62221
Microsoft Windows Use After Free Vulnerability - [Actively Exploited]
Description

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

INFO

Published Date :

Dec. 9, 2025, 6:15 p.m.

Last Modified :

Dec. 10, 2025, 1:48 p.m.

Remotely Exploit :

No

Source :

[email protected]
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Description :

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

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.

Notes :

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-62221 ; https://nvd.nist.gov/vuln/detail/CVE-2025-62221

Affected Products

The following products are affected by CVE-2025-62221 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Microsoft windows_server_2019
2 Microsoft windows_10_1809
3 Microsoft windows_10_21h2
4 Microsoft windows_10_22h2
5 Microsoft windows_server_2022
6 Microsoft windows_11_23h2
7 Microsoft windows_server_2022_23h2
8 Microsoft windows_server_23h2
9 Microsoft windows_11_24h2
10 Microsoft windows_server_2025
11 Microsoft windows_11_25h2
: Total Affected Vendor : 1 | Products : 11
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH f38d906d-7342-40ea-92c1-6c4a2c6478c8
CVSS 3.1 HIGH [email protected]
Solution
Install the latest cumulative security updates from Microsoft.
  • Apply the latest Windows security updates.
  • Ensure all systems are running the latest patch level.
Public PoC/Exploit Available at Github

CVE-2025-62221 has a 1 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-62221.

URL Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62221 Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-62221 US Government Resource
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-62221 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-62221 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
LoKinii/CVE-2025-62221-Exploit

Proof-of-Concept exploit for CVE-2025-62221, a use-after-free vuln in Windows Cloud Files Mini Filter Driver. Enables local privilege escalation to SYSTEM, even on patched systems, via crafted file ops in cloud dirs. Tested on Win 10/11/Server, stealthy and reliable for red teaming.

Updated: 5 days, 16 hours ago
1 stars 0 fork 0 watcher
Born at : Dec. 11, 2025, 4:55 a.m. This repo has been linked 1 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-62221 vulnerability anywhere in the article.

  • CybersecurityNews
CISA Warns of Windows Cloud Files Mini Filter 0-Day Vulnerability Exploited in Attacks

A critical alert regarding an active zero-day vulnerability affecting the Microsoft Windows Cloud Files Mini Filter Driver. The vulnerability poses a significant risk to organizations running affected ... Read more

Published Date: Dec 14, 2025 (2 days, 7 hours ago)
  • CybersecurityNews
Top 20 Most Exploited Vulnerabilities of 2025: A Comprehensive Analysis

The cybersecurity landscape of 2025 has been marked by an unprecedented surge in vulnerability exploitation, with threat actors leveraging critical flaws across enterprise software, cloud infrastructu ... Read more

Published Date: Dec 12, 2025 (4 days, 7 hours ago)
  • TheCyberThrone
Fortinet Critical Bugs CVE-2025-59718 and CVE-2025-59719

December 11, 2025Fortinet recently disclosed two critical authentication bypass vulnerabilities in its FortiCloud SSO login feature, tracked as CVE-2025-59718 and CVE-2025-59719. These flaws allow una ... Read more

Published Date: Dec 11, 2025 (5 days, 17 hours ago)
  • The Cyber Express
Microsoft Patch Tuesday December 2025: One Zero-Day, Six High-Risk Flaws Fixed

Microsoft patched 57 vulnerabilities in its Patch Tuesday December 2025 update, including one exploited zero-day and six high-risk vulnerabilities. The exploited zero-day is CVE-2025-62221, a 7.8-rate ... Read more

Published Date: Dec 10, 2025 (6 days, 3 hours ago)
  • TheCyberThrone
CVE-2025-6218 and CVE-2025-62221 Hit CISA KEV

December 10, 2025CISA has added CVE-2025-6218 and CVE-2025-62221 to its Known Exploited Vulnerabilities (KEV) catalog, signaling active real-world exploitation and immediate remediation requirements f ... Read more

Published Date: Dec 10, 2025 (6 days, 6 hours ago)
  • security.nl
Microsoft dicht aangevallen Windows-lek dat aanvaller SYSTEM-rechten geeft

Tijdens de patchdinsdag van december heeft Microsoft een actief aangevallen kwetsbaarheid in Windows verholpen waardoor een aanvaller die al toegang tot een systeem heeft SYSTEM-rechten kan krijgen. H ... Read more

Published Date: Dec 10, 2025 (6 days, 13 hours ago)
  • CrowdStrike.com
December 2025 Patch Tuesday: One Critical Zero-Day, Two Publicly Disclosed Vulnerabilities Among 57 CVEs

Microsoft has addressed 57 vulnerabilities in its December 2025 security update release. This month's updates address one actively exploited Important zero-day, two publicly disclosed Important zero-d ... Read more

Published Date: Dec 10, 2025 (6 days, 13 hours ago)
  • CybersecurityNews
Windows Cloud Files Mini Filter Driver 0-Day Vulnerability Exploited in the Wild to Escalate Privileges

Microsoft has released urgent security updates to address a zero-day vulnerability in the Windows Cloud Files Mini Filter Driver (cldflt.sys) that is currently being exploited in the wild. Assigned th ... Read more

Published Date: Dec 10, 2025 (6 days, 18 hours ago)
  • Daily CyberSecurity
CISA KEV Alert: WinRAR Zero-Day Used for Malware Injection and Windows UAF RCE Under Active Attack

The Cybersecurity and Infrastructure Security Agency (CISA) has issued a new mandate for federal agencies to patch their systems immediately, following evidence of active exploitation in the wild. The ... Read more

Published Date: Dec 10, 2025 (6 days, 19 hours ago)
  • Daily CyberSecurity
Microsoft Patches Three Zero-Days Including Active Cloud Files UAF to SYSTEM and Copilot RCE

Microsoft has closed out the year with a substantial security update, addressing 72 vulnerabilities across its ecosystem in the December 2025 Patch Tuesday release. The update fixes three critical fla ... Read more

Published Date: Dec 10, 2025 (6 days, 19 hours ago)
  • TheCyberThrone
Microsoft Patch Tuesday December 2025

Microsoft’s final Patch Tuesday of 2025, released on December 9, addresses approximately 56-57 vulnerabilities across Windows, Office, Exchange, and related components, including three zero-days and s ... Read more

Published Date: Dec 10, 2025 (6 days, 20 hours ago)
  • krebsonsecurity.com
Microsoft Patch Tuesday, December 2025 Edition

Microsoft today pushed updates to fix at least 56 security flaws in its Windows operating systems and supported software. This final Patch Tuesday of 2025 tackles one zero-day bug that is already bein ... Read more

Published Date: Dec 09, 2025 (6 days, 22 hours ago)
  • BleepingComputer
Microsoft December 2025 Patch Tuesday fixes 3 zero-days, 57 flaws

Today is Microsoft's December 2025 Patch Tuesday, which fixes 57 flaws, including one actively exploited and two publicly disclosed zero-day vulnerabilities. This Patch Tuesday also addresses three "C ... Read more

Published Date: Dec 09, 2025 (1 week ago)
  • Zero Day Initiative
The December 2025 Security Update Review

It’s the final patch Tuesday of 2025, but that doesn’t make it any less exciting. Put aside your holiday planning for just a moment as we review the latest security offering from Adobe and Microsoft. ... Read more

Published Date: Dec 09, 2025 (1 week ago)
  • CybersecurityNews
Microsoft December 2025 Patch Tuesday – 56 Vulnerabilities Fixed Including 3 Zero-days

CVE-2025-62554Microsoft Office Remote Code Execution VulnerabilityCriticalRemote Code ExecutionAccess of resource using incompatible type (‘type confusion’) in Microsoft Office allows an unauthorized ... Read more

Published Date: Dec 09, 2025 (1 week ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-62221 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Dec. 10, 2025

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* versions up to (excluding) 10.0.17763.8146 *cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:* versions up to (excluding) 10.0.17763.8146 *cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.19044.6691 *cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.19045.6691 *cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.22631.6345 *cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.17763.8146 *cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.25398.2025 *cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.26100.7392 *cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.26200.7392 *cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.20348.4467 *cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.26100.7392
    Added Reference Type Microsoft Corporation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62221 Types: Vendor Advisory
    Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-62221 Types: US Government Resource
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Dec. 09, 2025

    Action Type Old Value New Value
    Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-62221
  • New CVE Received by [email protected]

    Dec. 09, 2025

    Action Type Old Value New Value
    Added Description Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Added CWE CWE-416
    Added Reference https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62221
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 7.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact