Threat Intelligence / CVE / CVE-2020-17103

CVE-2020-17103 — Microsoft Windows 10

CVSS v3.1 7 (HIGH) · EPSS 1.0% (higher than 77.3% of all scored CVEs) · Priority 6.6/10 · Published 2020-12-09

As of 2026-05-18, CVE-2020-17103 is a HIGH-severity vulnerability in Microsoft Windows 10, CVSS v3.1 7, EPSS 1.0% (77.3th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2020-17103, most recently “Windows 'MiniPlasma' Zero-Day — Unpatched SYSTEM LPE via cldflt.sys HsmOsBlockPlaceholderAccess / CfAbortHydration (CVE-2020-17103 Regression)”.

Last updated: 2026-05-18

What is CVE-2020-17103?

Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

The record classifies CVE-2020-17103 under weakness class CWE-269. Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 3 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 2113 days ago.

Severity and exploitation probability

CVSS v3.1 base score
7 — HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
EPSS (FIRST)
1.0% probability of exploitation in the next 30 days, higher than 77.3% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
6.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2020-12-09, last modified 2026-05-18

Is CVE-2020-17103 being exploited?

It currently carries a trending score of 24 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2020-17103

The record marks a vendor fix as available for CVE-2020-17103. Patch reference: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17103. Vendor advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17103. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2020-17103

1 tracked threat in the Threadlinqs corpus references CVE-2020-17103, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Seeded from cveorg and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2020-17103 are available via the Threadlinqs MCP server (Purple tier). View plans →

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