CVE-2021-34484

Windows User Profile Service Elevation of Privilege Vulnerability

CVSS 3.1 High 7.8Known exploited (CISA KEV)

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

Description

Windows User Profile Service Elevation of Privilege Vulnerability

Key data

CVSS 3.1 High 7.8

Score published by microsoft in the CVE record.

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

Attack vector: Local
The attacker needs local access to the system, or to trick a user into running something.
Attack complexity: Low
No special conditions are needed. The attack can be repeated at will.
Privileges required: Low
A basic user account is needed.
User interaction: None
No action from any user is needed.
Scope: Unchanged
The impact stays within the vulnerable component.
Confidentiality impact: High
Serious or total effect on the secrecy of data.
Integrity impact: High
Serious or total effect on the trustworthiness of data.
Availability impact: High
Serious or total effect on availability.

Metric	Value	What it means
Attack vector	Local	The attacker needs local access to the system, or to trick a user into running something.
Attack complexity	Low	No special conditions are needed. The attack can be repeated at will.
Privileges required	Low	A basic user account is needed.
User interaction	None	No action from any user is needed.
Scope	Unchanged	The impact stays within the vulnerable component.
Confidentiality impact	High	Serious or total effect on the secrecy of data.
Integrity impact	High	Serious or total effect on the trustworthiness of data.
Availability impact	High	Serious or total effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score: 0.21827 (21.8% probability)
Percentile: 97.7%
Scores of: Nov 10, 2026
Model: v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.

Name in the catalog: Microsoft Windows User Profile Service Privilege Escalation Vulnerability
Added to the catalog: Mar 31, 2022
Federal due date: Apr 21, 2022

CISA assessment as of Feb 4, 2025

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Exploitation: Recorded by CISA as active
Automatable: no
Technical impact: total

Affected products

Products listed in the CVE record, as the CNA published them.

Microsoft Windows 10 Version 1507
- affected: 10.0.10240.0 up to before 10.0.10240.19022
Microsoft Windows 10 Version 1607
- affected: 10.0.14393.0 up to before 10.0.14393.4583
Microsoft Windows 10 Version 1809
- affected: 10.0.17763.0 up to before 10.0.17763.2114
Microsoft Windows 10 Version 1809
- affected: 10.0.0 up to before 10.0.17763.2114
Microsoft Windows 10 Version 1909
- affected: 10.0.0 up to before 10.0.18363.1734
Microsoft Windows 10 Version 2004
- affected: 10.0.0 up to before 10.0.19041.1165
Microsoft Windows 10 Version 20H2
- affected: 10.0.0 up to before 10.0.19042.1165
Microsoft Windows 10 Version 21H1
- affected: 10.0.0 up to before 10.0.19043.1165
Microsoft Windows 7
- affected: 6.1.0 up to before 6.1.7601.25685
Microsoft Windows 7 Service Pack 1
- affected: 6.1.0 up to before 6.1.7601.25685
Microsoft Windows 8.1
- affected: 6.3.0 up to before 6.3.9600.20094
Microsoft Windows Server 2008 R2 Service Pack 1
- affected: 6.1.7601.0 up to before 6.1.7601.25685
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)
- affected: 6.1.7601.0 up to before 6.1.7601.25685
Microsoft Windows Server 2008 Service Pack 2
- affected: 6.0.6003.0 up to before 6.0.6003.21192
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation)
- affected: 6.0.6003.0 up to before 6.0.6003.21192
Microsoft Windows Server 2012
- affected: 6.2.9200.0 up to before 6.2.9200.23435
Microsoft Windows Server 2012 (Server Core installation)
- affected: 6.2.9200.0 up to before 6.2.9200.23435
Microsoft Windows Server 2012 R2
- affected: 6.3.9600.0 up to before 6.3.9600.20094
Microsoft Windows Server 2012 R2 (Server Core installation)
- affected: 6.3.9600.0 up to before 6.3.9600.20094
Microsoft Windows Server 2016
- affected: 10.0.14393.0 up to before 10.0.14393.4583
Microsoft Windows Server 2016 (Server Core installation)
- affected: 10.0.14393.0 up to before 10.0.14393.4583
Microsoft Windows Server 2019
- affected: 10.0.17763.0 up to before 10.0.17763.2114
Microsoft Windows Server 2019 (Server Core installation)
- affected: 10.0.17763.0 up to before 10.0.17763.2114
Microsoft Windows Server version 2004
- affected: 10.0.0 up to before 10.0.19041.1165
Microsoft Windows Server version 20H2
- affected: 10.0.0 up to before 10.0.19042.1165

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Windows User Profile Service Elevation of Privilege Vulnerability (msrc.microsoft.com)vendor-advisorypatch
portal.msrc.microsoft.com/en-US/security-guidance/advisory/…

Timeline

ID reservedJun 9, 2021
Record publishedAug 12, 2021
Added to CISA KEVMar 31, 2022
Record last updatedAug 10, 2026

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:29 UTC. Sources and licenses