CVE-2020-17103Windows 10 Vulnerability
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
Published Dec 9, 2020 · Updated Jun 10, 2026
Key Facts
Patch immediately- CVE-2020-17103 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Windows 10 (Microsoft), Windows Server 2016 (Microsoft), Windows Server 2019 (Microsoft) and 8 more products.
- It is exploited in the wild, listed in Industry KEV feed since May 19, 2026. No public exploit code is known.
- EPSS estimates a 22% probability of exploitation in the next 30 days.
- Fixed versions are available, including Windows 10 Version 1809 10.0.17763.8880, Windows 11 version 23H2 10.0.22631.7219, Windows 11 Version 24H2 10.0.26100.8655.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
22%
Higher than 97.6% of all scored CVEs
Exploit maturity
Exploited (KEV)
ATLAS score
44/100
Publication score, see How it works
Exploitation Verdict
KEV listed
May 19, 2026
1987 days after publication
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Exploited (KEV)
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
2
Reports of active use
Advisories And Exploit References
Description
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | May 19, 2026 | n/a | Not reported |
Affected Products
22 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 10Microsoft | 1803, 1809, 1903, 1909, 2004, 20h2 | n/a |
| Windows Server 2016Microsoft | 1903, 1909, 2004, 20h2 | n/a |
| Windows Server 2019Microsoft | >= 10.0.17763.0 | 10.0.17763.8880 |
| Windows 10 Version 1809 | >= 10.0.17763.0 | 10.0.17763.8880 |
| Windows 11 version 23H2 | >= 10.0.22631.0 | 10.0.22631.7219 |
Patched Releases
Windows 10 Version 1809
10.0.17763.8880
Windows 11 version 23H2
10.0.22631.7219
Windows 11 Version 24H2
10.0.26100.8655
Windows 11 Version 25H2
10.0.26200.8655
Windows 11 version 26H1
10.0.28000.2269
Windows Server 2019
10.0.17763.8880
Windows Server 2019 (Server Core installation)
10.0.17763.8880
Windows Server 2025
10.0.26100.32995
Windows Server 2025 (Server Core installation)
10.0.26100.32995
Timeline
Publicly disclosed
Dec 9, 2020
Added to Industry KEV feed
May 19, 2026
Last updated
Jun 10, 2026
Weakness Type
- CWE-269 Improper Privilege Management
FAQ
Common Questions.
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
Affected: Windows 10 (Microsoft) versions 1803, 1809, 1903, 1909, 2004, 20h2; Windows Server 2016 (Microsoft) versions 1903, 1909, 2004, 20h2; Windows Server 2019 (Microsoft) versions >= 10.0.17763.0, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since May 19, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Windows 10 Version 1809 10.0.17763.8880, Windows 11 version 23H2 10.0.22631.7219, Windows 11 Version 24H2 10.0.26100.8655.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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