Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
Microsoft Update Notification Manager
AV AC PR UI S C I A CVSS EPSS %ile KEV
L L L N U H H H 7.8 .0304 86.5 YES
AFFECTED
Product Versions Fixed
Windows 10 Version 1709 for 32-bit Systems – —
Windows 10 Version 1903 for ARM64-based Systems unspecified – —
Windows 10 Version 1903 for 32-bit Systems unspecified – —
Windows 10 Version 1903 for x64-based Systems unspecified – —
Windows Server 2019 – —
Windows Server, version 1903 (Server Core installation) unspecified – —
Windows 10 Version 1909 for 32-bit Systems unspecified – —
Windows 10 Version 1909 for x64-based Systems unspecified – —
Windows Server, version 1909 (Server Core installation) unspecified – —
Windows 10 Version 1909 for ARM64-based Systems unspecified – —
TIMELINE
Nov 4 Reserved by microsoft
May 23 Added to CISA KEV, remediation due 2022-06-13
May 23 Published (CNA: microsoft)
Description
An elevation of privilege vulnerability exists in the way the Update Notification Manager handles files.To exploit this vulnerability, an attacker would first have to gain execution on the victim system, aka 'Update Notification Manager Elevation of Privilege Vulnerability'.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| November 4, 2019 | Reserved | Reserved by microsoft |
| May 23, 2022 | KEV ADDED | Added to CISA KEV, remediation due 2022-06-13 |
| May 23, 2022 | Published | Published (CNA: microsoft) |
Affected
Affected products and packages — 10 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Microsoft | Windows | — | 10 Version 1709 for 32-bit Systems | — |
| Microsoft | Windows 10 Version 1903 for ARM64-based Systems | — | unspecified | — |
| Microsoft | Windows 10 Version 1903 for 32-bit Systems | — | unspecified | — |
| Microsoft | Windows 10 Version 1903 for x64-based Systems | — | unspecified | — |
| Microsoft | Windows Server | — | 2019 | — |
| Microsoft | Windows Server, version 1903 (Server Core installation) | — | unspecified | — |
| Microsoft | Windows 10 Version 1909 for 32-bit Systems | — | unspecified | — |
| Microsoft | Windows 10 Version 1909 for x64-based Systems | — | unspecified | — |
| Microsoft | Windows Server, version 1909 (Server Core installation) | — | unspecified | — |
| Microsoft | Windows 10 Version 1909 for ARM64-based Systems | — | unspecified | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-0638 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.