# CVE-2020-0638: Microsoft Update Notification Manager Privilege Escalation Vulnerability

> CVE-2020-0638: Microsoft Update Notification Manager Privilege Escalation Vulnerability. CVSS 7.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2020-0638
Last updated: 2026-08-12T03:56:03Z

- Published: 2020-01-14 23:11 UTC · Updated: 2026-08-12 03:56 UTC · Assigner: microsoft
- CVSS: 7.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS: 2.4%, 84th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-05-23, federal due date 2022-06-13, ransomware use: Known

## 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'.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Microsoft: Windows
- Microsoft: Windows 10 Version 1903 for 32-bit Systems
- Microsoft: Windows 10 Version 1903 for ARM64-based Systems
- Microsoft: Windows 10 Version 1903 for x64-based Systems
- Microsoft: Windows 10 Version 1909 for 32-bit Systems
- Microsoft: Windows 10 Version 1909 for ARM64-based Systems
- Microsoft: Windows 10 Version 1909 for x64-based Systems
- Microsoft: Windows Server
- Microsoft: Windows Server, version 1903 (Server Core installation)
- Microsoft: Windows Server, version 1909 (Server Core installation)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2020-0638)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2020-0638)
- [https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0638](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0638)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2020-0638 · Markdown: https://rewindex.com/cve/CVE-2020-0638.md · JSON: https://rewindex.com/api/v1/cves/CVE-2020-0638 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:51:43.947Z