CVE-2021-34484

mediumpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.218 · 98 %ileEURUUS

grimoire priorityP0 · Act now

Exploitable?

Yes · in the wild

CISA KEV

Likely / severe?

21.8% (98th) EPSS

CVSS 4.6 · medium

Is it mine?

145 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · msrc_csaf

added 2022-03-31remediate by 2022-04-21

required action Apply updates per vendor instructions.

EPSS · scored 2026-10-27

Microsoft Windows User Profile Service Privilege Escalation Vulnerability

Windows User Profile Service Elevation of Privilege Vulnerability

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedWindows 10 Version 1607 for 32-bit Systemsmsrc_csaf
10.0.14393.4583:Security Update:https://support.microsoft.com/help/5005043
https://support.microsoft.com/help/5005043
FixedWindows 10 Version 1607 for x64-based Systemsmsrc_csaf
10.0.14393.4583:Security Update:https://support.microsoft.com/help/5005043
https://support.microsoft.com/help/5005043
FixedWindows 10 Version 1809 for 32-bit Systemsmsrc_csaf
10.0.17763.2114:Security Update:https://support.microsoft.com/help/5005030
https://support.microsoft.com/help/5005030
FixedWindows 10 Version 1809 for ARM64-based Systemsmsrc_csaf
10.0.17763.2114:Security Update:https://support.microsoft.com/help/5005030
https://support.microsoft.com/help/5005030
FixedWindows 10 Version 1809 for x64-based Systemsmsrc_csaf
10.0.17763.2114:Security Update:https://support.microsoft.com/help/5005030
https://support.microsoft.com/help/5005030
FixedWindows 10 Version 1909 for 32-bit Systemsmsrc_csaf
10.0.18363.1734:Security Update:https://support.microsoft.com/help/5005031
https://support.microsoft.com/help/5005031
FixedWindows 10 Version 1909 for ARM64-based Systemsmsrc_csaf
10.0.18363.1734:Security Update:https://support.microsoft.com/help/5005031
https://support.microsoft.com/help/5005031
FixedWindows 10 Version 1909 for x64-based Systemsmsrc_csaf
10.0.18363.1734:Security Update:https://support.microsoft.com/help/5005031
https://support.microsoft.com/help/5005031
FixedWindows 10 Version 2004 for 32-bit Systemsmsrc_csaf
10.0.19041.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows 10 Version 2004 for ARM64-based Systemsmsrc_csaf
10.0.19041.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows 10 Version 2004 for x64-based Systemsmsrc_csaf
10.0.19041.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows 10 Version 20H2 for 32-bit Systemsmsrc_csaf
10.0.19042.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows 10 Version 20H2 for ARM64-based Systemsmsrc_csaf
10.0.19042.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows 10 Version 21H1 for 32-bit Systemsmsrc_csaf
10.0.19043.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows 10 Version 21H1 for ARM64-based Systemsmsrc_csaf
10.0.19043.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows 10 Version 21H1 for x64-based Systemsmsrc_csaf
10.0.19043.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows 10 for 32-bit Systemsmsrc_csaf
10.0.10240.19022:Security Update:https://support.microsoft.com/help/5005040
https://support.microsoft.com/help/5005040
FixedWindows 10 for x64-based Systemsmsrc_csaf
10.0.10240.19022:Security Update:https://support.microsoft.com/help/5005040
https://support.microsoft.com/help/5005040
FixedWindows 7 for 32-bit Systems Service Pack 1msrc_csaf
6.1.7601.25685:Monthly Rollup:https://support.microsoft.com/help/5005088
https://support.microsoft.com/help/5005088
FixedWindows 7 for x64-based Systems Service Pack 1msrc_csaf
6.1.7601.25685:Monthly Rollup:https://support.microsoft.com/help/5005088
https://support.microsoft.com/help/5005088
FixedWindows 8.1 for 32-bit systemsmsrc_csaf
6.3.9600.20094:Monthly Rollup:https://support.microsoft.com/help/5005076
https://support.microsoft.com/help/5005076
FixedWindows 8.1 for x64-based systemsmsrc_csaf
6.3.9600.20094:Monthly Rollup:https://support.microsoft.com/help/5005076
https://support.microsoft.com/help/5005076
FixedWindows RT 8.1msrc_csaf
6.3.9600.20094:Monthly Rollup:https://support.microsoft.com/help/5005076
https://support.microsoft.com/help/5005076
FixedWindows Server 2008 R2 for x64-based Systems Service Pack 1msrc_csaf
6.1.7601.25685:Monthly Rollup:https://support.microsoft.com/help/5005088
https://support.microsoft.com/help/5005088
FixedWindows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)msrc_csaf
6.1.7601.25685:Monthly Rollup:https://support.microsoft.com/help/5005088
https://support.microsoft.com/help/5005088
FixedWindows Server 2008 for 32-bit Systems Service Pack 2msrc_csaf
6.0.6003.21192:Monthly Rollup:https://support.microsoft.com/help/5005090
https://support.microsoft.com/help/5005090
FixedWindows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)msrc_csaf
6.0.6003.21192:Monthly Rollup:https://support.microsoft.com/help/5005090
https://support.microsoft.com/help/5005090
FixedWindows Server 2008 for x64-based Systems Service Pack 2msrc_csaf
6.0.6003.21192:Monthly Rollup:https://support.microsoft.com/help/5005090
https://support.microsoft.com/help/5005090
FixedWindows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)msrc_csaf
6.0.6003.21192:Monthly Rollup:https://support.microsoft.com/help/5005090
https://support.microsoft.com/help/5005090
FixedWindows Server 2012msrc_csaf
6.2.9200.23435:Security Only:https://support.microsoft.com/help/5005094
https://support.microsoft.com/help/5005094
FixedWindows Server 2012 (Server Core installation)msrc_csaf
6.2.9200.23435:Security Only:https://support.microsoft.com/help/5005094
https://support.microsoft.com/help/5005094
FixedWindows Server 2012 R2msrc_csaf
6.3.9600.20094:Monthly Rollup:https://support.microsoft.com/help/5005076
https://support.microsoft.com/help/5005076
FixedWindows Server 2012 R2 (Server Core installation)msrc_csaf
6.3.9600.20094:Monthly Rollup:https://support.microsoft.com/help/5005076
https://support.microsoft.com/help/5005076
FixedWindows Server 2016msrc_csaf
10.0.14393.4583:Security Update:https://support.microsoft.com/help/5005043
https://support.microsoft.com/help/5005043
FixedWindows Server 2016 (Server Core installation)msrc_csaf
10.0.14393.4583:Security Update:https://support.microsoft.com/help/5005043
https://support.microsoft.com/help/5005043
FixedWindows Server 2019msrc_csaf
10.0.17763.2114:Security Update:https://support.microsoft.com/help/5005030
https://support.microsoft.com/help/5005030
FixedWindows Server 2019 (Server Core installation)msrc_csaf
10.0.17763.2114:Security Update:https://support.microsoft.com/help/5005030
https://support.microsoft.com/help/5005030
FixedWindows Server, version 2004 (Server Core installation)msrc_csaf
10.0.19041.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows Server, version 20H2 (Server Core Installation)msrc_csaf
10.0.19042.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033

cvss

Technical severity, 0–10. One row per scoring source.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.6–7.8

v2.04.6mediumAV:L/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 3.9 · impact 6.4

v2.04.6mediumAV:L/AC:L/Au:N/C:P/I:P/A:P/E:Hsecondary · CVSS-BT (t0sche)

v3.17.8highAV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · secure@microsoft.com USexploitability 1.8 · impact 5.9

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · ENISA EU

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · NVD / NIST USexploitability 1.8 · impact 5.9

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-264US

affected products (145)

Products and version ranges known to be affected.

Microsoft Windows 10 Version 150710.0.10240.0 → 10.0.10240.19022enisa_euvdEU
Microsoft Windows 10 Version 160710.0.14393.0 → 10.0.14393.4583enisa_euvdEU
Microsoft Windows 10 Version 180910.0.0 → 10.0.17763.2114enisa_euvdEU
Microsoft Windows 10 Version 180910.0.17763.0 → 10.0.17763.2114enisa_euvdEU
Microsoft Windows 10 Version 190910.0.0 → 10.0.18363.1734enisa_euvdEU
Microsoft Windows 10 Version 200410.0.0 → 10.0.19041.1165enisa_euvdEU
Microsoft Windows 10 Version 20H210.0.0 → 10.0.19042.1165enisa_euvdEU
Microsoft Windows 10 Version 21H110.0.0 → 10.0.19043.1165enisa_euvdEU
Microsoft Windows 76.1.0 → 6.1.7601.25685enisa_euvdEU
Microsoft Windows 7 Service Pack 16.1.0 → 6.1.7601.25685enisa_euvdEU
Microsoft Windows 8.16.3.0 → 6.3.9600.20094enisa_euvdEU
Microsoft Windows Server 2008 R2 Service Pack 16.1.7601.0 → 6.1.7601.25685enisa_euvdEU
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)6.1.7601.0 → 6.1.7601.25685enisa_euvdEU
Microsoft Windows Server 2008 Service Pack 26.0.6003.0 → 6.0.6003.21192enisa_euvdEU
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation)6.0.6003.0 → 6.0.6003.21192enisa_euvdEU
Microsoft Windows Server 20126.2.9200.0 → 6.2.9200.23435enisa_euvdEU
Microsoft Windows Server 2012 (Server Core installation)6.2.9200.0 → 6.2.9200.23435enisa_euvdEU
Microsoft Windows Server 2012 R26.3.9600.0 → 6.3.9600.20094enisa_euvdEU
Microsoft Windows Server 2012 R2 (Server Core installation)6.3.9600.0 → 6.3.9600.20094enisa_euvdEU
Microsoft Windows Server 201610.0.14393.0 → 10.0.14393.4583enisa_euvdEU

showing 20 of 145

advisories (1)

Vendor and ecosystem advisories describing this.

msrc_CVE-2021-34484Windows User Profile Service Elevation of Privilege Vulnerability2021-08-10csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu msrc_csaf NVD CVE.org MITRE

published 2021-08-12modified 2026-08-10

references (12)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan