Microsoft

CVE-2020-17103: Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of 29 Oct 2026.

VulnCheck KEV lists it since 19 May 2026. It cites 2 public reports, the first from 19 May 2026.

How likely is exploitation in the next 30 days?

23.8%

Up from 22.2% on 23 Oct 2026.

EPSS score, percentile 97.8 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

7.0 High

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (1)

Which versions are affected?

Affected

from 10.0.17763.0 to before 10.0.17763.8880
from 10.0.22631.0 to before 10.0.22631.7219
from 10.0.22631.0 to before 10.0.22631.7219
from 10.0.26100.0 to before 10.0.26100.8655
from 10.0.26200.0 to before 10.0.26200.8655
from 10.0.28000.0 to before 10.0.28000.2269

and 4 more in the table below

Versions by product

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; VulnCheck KEV, as of 30 Oct 2026; FIRST EPSS, as of 30 Oct 2026; CVE List, as of 30 Oct 2026. About the data.

Description

Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

Source: CVE List, as of 30 Oct 2026. About the data.

What to do

Advisories and patches

Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability (Vendor advisory, Patch)

This summary is based on the CVE record as of 30 Oct 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (10 products)

Microsoft Windows 10 Version 1809
Status	Versions
Affected	from 10.0.17763.0 to before 10.0.17763.8880

Microsoft Windows 11 version 23H2
Status	Versions
Affected	from 10.0.22631.0 to before 10.0.22631.7219

Microsoft Windows 11 Version 23H2
Status	Versions
Affected	from 10.0.22631.0 to before 10.0.22631.7219

Microsoft Windows 11 Version 24H2
Status	Versions
Affected	from 10.0.26100.0 to before 10.0.26100.8655

Microsoft Windows 11 Version 25H2
Status	Versions
Affected	from 10.0.26200.0 to before 10.0.26200.8655

Microsoft Windows 11 version 26H1
Status	Versions
Affected	from 10.0.28000.0 to before 10.0.28000.2269

Microsoft Windows Server 2019
Status	Versions
Affected	from 10.0.17763.0 to before 10.0.17763.8880

Microsoft Windows Server 2019 (Server Core installation)
Status	Versions
Affected	from 10.0.17763.0 to before 10.0.17763.8880

Microsoft Windows Server 2025
Status	Versions
Affected	from 10.0.26100.0 to before 10.0.26100.32995

Microsoft Windows Server 2025 (Server Core installation)
Status	Versions
Affected	from 10.0.26100.0 to before 10.0.26100.32995

Source: CVE List, as of 30 Oct 2026. About the data.

Weakness

CWE-269

CWE-269: Improper Privilege Management

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

Date	Event
9 Dec 2020	CVE record published
10 Jun 2026	CVE record last updated

Known exploited Microsoft vulnerabilities

CVE-2026-96951: Microsoft Windows Command Injection Vulnerability (added 13 Oct 2026)
CVE-2026-65660: Microsoft SharePoint Code Injection Vulnerability (added 25 Sep 2026)
CVE-2026-81963: Microsoft Windows Link Following Vulnerability (added 8 Sep 2026)
CVE-2026-85880: Microsoft Windows Heap-Based Buffer Overflow Vulnerability (added 8 Sep 2026)
CVE-2019-1068: Microsoft SQL Server Remote Code Execution Vulnerability (added 26 Aug 2026)