CVE-2020-0638

Summary

CVE	CVE-2020-0638
State	PUBLISHED
Assigner	microsoft
Source Priority	CVE Program / NVD first with legacy fallback
Published	2020-01-14 23:15:32 UTC
Updated	2026-08-12 05:17:27 UTC
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'.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.030420000 probability, percentile 0.863280000 (date 2026-08-13)

CISA KEV: Listed on 2022-05-23; due 2022-06-13; ransomware use Known

Problem Types: NVD-CWE-noinfo | CWE-59 | Elevation of Privilege | CWE-59 CWE-59 Improper Link Resolution Before File Access ('Link Following')

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	7.8	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
3.1	ADP	DECLARED	7.8	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
3.1	134c704f-9b21-4f2e-91b3-4a467353bcc0	Secondary	7.8	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
2.0	[email protected]	Primary	4.6		`AV:L/AC:L/Au:N/C:P/I:P/A:P`

CVSS v3.1 Breakdown

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 Breakdown

Access Vector

Local

Access Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

AV:L/AC:L/Au:N/C:P/I:P/A:P

CISA Known Exploited Vulnerability

Vendor	Microsoft
Product	Update Notification Manager
Name	Microsoft Update Notification Manager Privilege Escalation Vulnerability
Required Action	Apply updates per vendor instructions.
Notes	https://nvd.nist.gov/vuln/detail/CVE-2020-0638

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Operating System	Microsoft	Windows 10 1709	-	All	All	All
Operating System	Microsoft	Windows 10 1709	-	All	All	All
Operating System	Microsoft	Windows 10 1803	-	All	All	All
Operating System	Microsoft	Windows 10 1803	-	All	All	All
Operating System	Microsoft	Windows 10 1809	-	All	All	All
Operating System	Microsoft	Windows 10 1809	-	All	All	All
Operating System	Microsoft	Windows 10 1809	-	All	All	All
Operating System	Microsoft	Windows 10 1903	-	All	All	All
Operating System	Microsoft	Windows 10 1903	-	All	All	All
Operating System	Microsoft	Windows 10 1903	-	All	All	All
Operating System	Microsoft	Windows 10 1909	-	All	All	All
Operating System	Microsoft	Windows 10 1909	-	All	All	All
Operating System	Microsoft	Windows 10 1909	-	All	All	All
Operating System	Microsoft	Windows Server 1803	-	All	All	All
Operating System	Microsoft	Windows Server 1903	-	All	All	All
Operating System	Microsoft	Windows Server 1909	-	All	All	All
Operating System	Microsoft	Windows Server 2019	-	All	All	All

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Microsoft	Windows	affected 10 Version 1709 for 32-bit Systems	Not specified
CNA	Microsoft	Windows	affected 10 Version 1803 for 32-bit Systems	Not specified
CNA	Microsoft	Windows	affected 10 Version 1809 for ARM64-based Systems	Not specified
CNA	Microsoft	Windows	affected 10 Version 1803 for x64-based Systems	Not specified
CNA	Microsoft	Windows	affected 10 Version 1709 for ARM64-based Systems	Not specified
CNA	Microsoft	Windows	affected 10 Version 1709 for x64-based Systems	Not specified
CNA	Microsoft	Windows	affected 10 Version 1803 for ARM64-based Systems	Not specified
CNA	Microsoft	Windows	affected 10 Version 1809 for 32-bit Systems	Not specified
CNA	Microsoft	Windows	affected 10 Version 1809 for x64-based Systems	Not specified
CNA	Microsoft	Windows 10 Version 1903 For ARM64-based Systems	affected unspecified	Not specified
CNA	Microsoft	Windows 10 Version 1903 For 32-bit Systems	affected unspecified	Not specified
CNA	Microsoft	Windows 10 Version 1903 For X64-based Systems	affected unspecified	Not specified
CNA	Microsoft	Windows Server	affected 2019	Not specified
CNA	Microsoft	Windows Server	affected 2019 (Core installation)	Not specified
CNA	Microsoft	Windows Server	affected version 1803 (Core Installation)	Not specified
CNA	Microsoft	Windows Server Version 1903 Server Core Installation	affected unspecified	Not specified
CNA	Microsoft	Windows 10 Version 1909 For 32-bit Systems	affected unspecified	Not specified
CNA	Microsoft	Windows 10 Version 1909 For X64-based Systems	affected unspecified	Not specified
CNA	Microsoft	Windows Server Version 1909 Server Core Installation	affected unspecified	Not specified
CNA	Microsoft	Windows 10 Version 1909 For ARM64-based Systems	affected unspecified	Not specified

References

Reference	Source	Link	Tags
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0638	af854a3a-2127-422b-91ae-364da2661108	portal.msrc.microsoft.com	Patch, Vendor Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog	134c704f-9b21-4f2e-91b3-4a467353bcc0	www.cisa.gov	US Government Resource
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis
CISA Known Exploited Vulnerabilities catalog	CISA	www.cisa.gov	kev

No vendor comments have been submitted for this CVE.

Additional Advisory Data

Source	Time	Event
ADP	2022-05-23T00:00:00.000Z	CVE-2020-0638 added to CISA KEV

There are currently no legacy QID mappings associated with this CVE.