KEV Intelligence

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2021-34484

Windows User Profile Service Elevation of Privilege Vulnerability

Microsoft / Windows 10 Version 1507 · affected before 10.0.10240.19022

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Severity
CVSS 7.8 · High
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
21.7%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2021-34484 is Windows User Profile Service Elevation of Privilege Vulnerability affecting Microsoft Windows 10 Version 1507 and 23 other products.

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Microsoft / Windows 10 Version 1507 affected before 10.0.10240.19022.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Windows User Profile Service Elevation of Privilege Vulnerability

Windows User Profile Service Elevation of Privilege Vulnerability

Vendor Product Affected Status
Microsoft Windows 10 Version 1507 Before 10.0.10240.19022 Affected
Microsoft Windows 10 Version 1607 Before 10.0.14393.4583 Affected
Microsoft Windows 10 Version 1809 Before 10.0.17763.2114 Affected
Microsoft Windows 10 Version 1809 Before 10.0.17763.2114 Affected
Microsoft Windows 10 Version 1909 Before 10.0.18363.1734 Affected
Microsoft Windows 10 Version 2004 Before 10.0.19041.1165 Affected
Microsoft Windows 10 Version 20H2 Before 10.0.19042.1165 Affected
Microsoft Windows 10 Version 21H1 Before 10.0.19043.1165 Affected
Microsoft Windows 7 Before 6.1.7601.25685 Affected
Microsoft Windows 7 Service Pack 1 Before 6.1.7601.25685 Affected
Microsoft Windows 8.1 Before 6.3.9600.20094 Affected
Microsoft Windows Server 2008 R2 Service Pack 1 Before 6.1.7601.25685 Affected
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) Before 6.1.7601.25685 Affected
Microsoft Windows Server 2008 Service Pack 2 Before 6.0.6003.21192 Affected
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) Before 6.0.6003.21192 Affected
Microsoft Windows Server 2012 Before 6.2.9200.23435 Affected
Microsoft Windows Server 2012 (Server Core installation) Before 6.2.9200.23435 Affected
Microsoft Windows Server 2012 R2 Before 6.3.9600.20094 Affected
Microsoft Windows Server 2012 R2 (Server Core installation) Before 6.3.9600.20094 Affected
Microsoft Windows Server 2016 Before 10.0.14393.4583 Affected
Microsoft Windows Server 2016 (Server Core installation) Before 10.0.14393.4583 Affected
Microsoft Windows Server 2019 Before 10.0.17763.2114 Affected
Microsoft Windows Server 2019 (Server Core installation) Before 10.0.17763.2114 Affected
Microsoft Windows Server version 2004 Before 10.0.19041.1165 Affected
Microsoft Windows Server version 20H2 Before 10.0.19042.1165 Affected
View vendor advisory (opens in new tab)
Published
12 Aug 2021
Exploitation Reported
31 Mar 2022
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None

Tags

cisa microsoft windows

CVE References

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 31 Mar 2022

Independent exploitation attestation added to the KEV Intelligence record.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source Added
CISA First 2022-03-31 00:00 UTC
CVE 2026-08-10 15:31 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
0
User-Agents
0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

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

EPSS

21.7%

All CVSS Scores

CVSS v3.1 7.8 High

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

CVSS v2.0 4.6 Medium

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

Timeline

From disclosure to observed exploitation

  1. KEV confirmed by CVE

    Exploitation attested by an external source

  2. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  3. CVE published

    Vulnerability disclosed publicly

  4. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2021-34484

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2021-34484",
  "confidence": "Confirmed",
  "cvss_score": 7.8,
  "cvss_estimated": false,
  "epss_score": 0.21661,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

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