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CVE-2021-34484

Microsoft Windows User Profile Service Privilege Escalation

7.8 HIGHActively exploited (CISA KEV)EPSS 21.8%
  1. Published12 Aug 2021
  2. Added to CISA KEV31 Mar 2022
  3. Remediation due21 Apr 2022
Actively exploited (CISA KEV)

Microsoft Windows User Profile Service contains an unspecified vulnerability that allows for privilege escalation.

Added to KEV: 31 Mar 2022Federal remediation due: 21 Apr 2022

Description

Windows User Profile Service Elevation of Privilege Vulnerability

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft Windows 10 1507< 10.0.10240.19022
Microsoft Windows 10 1607< 10.0.14393.4583
Microsoft Windows 10 1809< 10.0.17763.2114
Microsoft Windows 10 1909< 10.0.18363.1734
Microsoft Windows 10 2004< 10.0.19041.1165
Microsoft Windows 10 20h2< 10.0.19042.1165
Microsoft Windows 10 21h1< 10.0.19043.1165
Microsoft Windows 7all versions
Microsoft Windows 8.1all versions
Microsoft Windows Rt 8.1all versions
Microsoft Windows Server 2004< 10.0.19041.1165
Microsoft Windows Server 2008r2
Microsoft Windows Server 2012r2
Microsoft Windows Server 2016< 10.0.14393.4583
Microsoft Windows Server 2019< 10.0.17763.2114
Microsoft Windows Server 20h2< 10.0.19042.1165

Remediation

Fixed in
Microsoft Windows 10 1507≥ 10.0.10240.19022
Microsoft Windows 10 1607≥ 10.0.14393.4583
Microsoft Windows 10 1809≥ 10.0.17763.2114
Microsoft Windows 10 1909≥ 10.0.18363.1734
Microsoft Windows 10 2004≥ 10.0.19041.1165
Microsoft Windows 10 20h2≥ 10.0.19042.1165
Microsoft Windows 10 21h1≥ 10.0.19043.1165
Microsoft Windows Server 2004≥ 10.0.19041.1165
Microsoft Windows Server 2016≥ 10.0.14393.4583
Microsoft Windows Server 2019≥ 10.0.17763.2114

References

Frequently asked

Is CVE-2021-34484 being actively exploited?

Yes. CVE-2021-34484 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 31 Mar 2022.

How severe is CVE-2021-34484?

CVE-2021-34484 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 21.8% probability of exploitation.

Which products are affected by CVE-2021-34484?

Affected products include Microsoft Windows 10 1507, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 1909, Microsoft Windows 10 2004, and 11 more.

How do I fix CVE-2021-34484?

Upgrade affected software to a fixed version, for example Microsoft Windows 10 1507 10.0.10240.19022, Microsoft Windows 10 1607 10.0.14393.4583, Microsoft Windows 10 1809 10.0.17763.2114 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-34484 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.