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PatchSiren cyber security CVE debrief

CVE-2020-17103 Microsoft CVE debrief

CVE-2020-17103 is a Microsoft Windows elevation of privilege vulnerability affecting the Windows Cloud Files Mini Filter Driver. NVD rates it CVSS 3.1 7.0 High with a local attack vector, low privileges required, no user interaction, and high impacts to confidentiality, integrity, and availability. Microsoft’s update guide and advisory are referenced by NVD for remediation guidance.

Vendor
Microsoft
Product
CVE-2020-17103
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2020-12-10
Original CVE updated
2026-05-16
Advisory published
2020-12-10
Advisory updated
2026-05-16

Who should care

Windows administrators, endpoint security teams, and anyone responsible for patching Windows 10 and Windows Server systems listed by NVD. This is especially important where untrusted local code can run or where users have any ability to obtain a foothold on a machine.

Technical summary

NVD classifies CVE-2020-17103 as a local elevation of privilege issue in the Windows Cloud Files Mini Filter Driver. The published CVSS vector is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H. NVD lists affected Microsoft Windows 10 releases and Windows Server 2016/2019 entries, and a secondary community reference maps the weakness to CWE-269.

Defensive priority

High

Recommended defensive actions

  • Apply the Microsoft security update referenced in the MSRC update guide for CVE-2020-17103.
  • Verify patch coverage on the Windows 10 and Windows Server versions listed by NVD.
  • Prioritize systems that allow local logon by untrusted or semi-trusted users, since the issue is locally exploitable.
  • Use standard least-privilege and endpoint hardening controls to reduce the impact of any local foothold.
  • Track remediation status against the Microsoft advisory and NVD record for any updated affected-platform guidance.

Evidence notes

This debrief relies on the supplied NVD record and the Microsoft links cited in that record. The source corpus provides the CVSS 3.1 vector, affected CPE entries, publication date (2020-12-10), and Microsoft advisory/update-guide URLs. A GitHub reference is present in the corpus, but no unsupported technical claims were taken from it.

Official resources

Published on 2020-12-10. The supplied NVD record was last modified on 2026-05-16. No Known Exploited Vulnerabilities entry or ransomware linkage was provided in the supplied data.