CVE-2025-62221: Microsoft Windows Use After Free Vulnerability (Pentest Lab Guide)

CVE-2025-62221: Technical Deep-Dive (Auto Refreshed)

Generated on 2026-03-23T21:39:45.703Z. This file is automatically regenerated every 30 minutes by the CVE AI enrichment job using web sources (NVD, MITRE, CISA KEV, GitHub).

Executive Technical Summary

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

Context preserved from previous revision: Microsoft Windows Cloud Files Mini Filter Driver contains a use after free vulnerability that can allow an authorized attacker to elevate privileges locally. 1. Use only isolated environments and systems you own or are explicitly authorized to test.

Technical Details

CVE: CVE-2025-62221
KEV date added: 2025-12-09
KEV due date: 2025-12-30
NVD published: 2025-12-09
NVD modified: 2025-12-10
MITRE modified: 2026-02-26
CVSS base score: 7.8
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS exploitability score: 1.8
CVSS impact score: 5.9
Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Versions and Products Impacted

microsoft / windows 10 1809 (versions: < 10.0.17763.8146)
microsoft / windows 10 21h2 (versions: < 10.0.19044.6691)
microsoft / windows 10 22h2 (versions: < 10.0.19045.6691)
microsoft / windows 11 23h2 (versions: < 10.0.22631.6345)
microsoft / windows 11 24h2 (versions: < 10.0.26100.7392)
microsoft / windows 11 25h2 (versions: < 10.0.26200.7392)
microsoft / windows server 2019 (versions: < 10.0.17763.8146)
microsoft / windows server 2022 (versions: < 10.0.20348.4467)
microsoft / windows server 2022 23h2 (versions: < 10.0.25398.2025)
microsoft / windows server 2025 (versions: < 10.0.26100.7392)
Microsoft / Windows 10 Version 1809 (versions: 10.0.17763.0)
Microsoft / Windows 10 Version 21H2 (versions: 10.0.19044.0)
Microsoft / Windows 10 Version 22H2 (versions: 10.0.19045.0)
Microsoft / Windows 11 version 22H3 (versions: 10.0.22631.0)
Microsoft / Windows 11 Version 23H2 (versions: 10.0.22631.0)
Microsoft / Windows 11 Version 24H2 (versions: 10.0.26100.0)
Microsoft / Windows 11 Version 25H2 (versions: 10.0.26200.0)
Microsoft / Windows Server 2019 (versions: 10.0.17763.0)
Microsoft / Windows Server 2019 (Server Core installation) (versions: 10.0.17763.0)
Microsoft / Windows Server 2022 (versions: 10.0.20348.0)

Weakness Classification

CWE-416

Repositories for Lab Validation (Public Examples)

DarkFunct/TK-CVE-Repo | stars: 43 | updated: 2026-03-23 | https://github.com/DarkFunct/TK-CVE-Repo
Notes: TK-CVE-Repo
Teodor1231241/DEMO-Proof-of-Concept-Temporal-Memory-Inconsistency-in-cldflt.sys-CVE-2025-62221 | stars: 0 | updated: 2026-01-18 | https://github.com/Teodor1231241/DEMO-Proof-of-Concept-Temporal-Memory-Inconsistency-in-cldflt.sys-CVE-2025-62221
codeaseguro/noti-vulns | stars: 0 | updated: 2025-12-31 | https://github.com/codeaseguro/noti-vulns
Notes: Repositorio centralizado de alertas, vulnerabilidades críticas. Análisis técnico, mitigaciones y buenas practicas. Actualizado periódicamente. 🚀

People and Organizations Mentioned

microsoft
Windows
DarkFunct
Teodor1231241
codeaseguro

Practical Defensive Validation (Authorized Only)

Use only isolated environments and systems you own or are explicitly authorized to test.
Snapshot infrastructure before validation and preserve baseline logs (EDR, SIEM, OS, app).
Inventory microsoft / windows 10 1809 (versions: < 10.0.17763.8146) assets and confirm exact vulnerable versions with automated checks.
Patch in staged environments and validate closure with scanners + service health checks.
Map detections to MITRE ATT&CK tactics relevant to your environment and tune alert quality.

References

NVD record: https://nvd.nist.gov/vuln/detail/CVE-2025-62221
MITRE CVE record: https://www.cve.org/CVERecord?id=CVE-2025-62221
CISA KEV Catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
CISA KEV JSON feed: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
KEV notes: https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-62221 ; https://nvd.nist.gov/vuln/detail/CVE-2025-62221
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62221
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-62221
Repository example: https://github.com/DarkFunct/TK-CVE-Repo
Repository example: https://github.com/Teodor1231241/DEMO-Proof-of-Concept-Temporal-Memory-Inconsistency-in-cldflt.sys-CVE-2025-62221
Repository example: https://github.com/codeaseguro/noti-vulns

This content is for defensive security training and authorized validation only.