CVE-2021-34536Known exploitation

Local privilege escalation

Published Aug 12, 2021 · Updated Aug 10, 2026

Windows Storage Spaces Controller in Microsoft Windows 10 Version 1507 and related releases allows local users to gain elevated privileges. The published records do not disclose the specific controller operation or code path that mishandles input. Local users must already have a low-privilege account, and the consequence is unauthorized escalation to higher system privileges.

CVSS severity4.6
Medium
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Windows Storage Spaces Controller in Microsoft Windows 10 Version 1507 and related releases allows local users to gain elevated privileges. The published records do not disclose the specific controller operation or code path that mishandles input. Local users must already have a low-privilege account, and the consequence is unauthorized escalation to higher system privileges.

The record

CVE
CVE-2021-34536
Published
Aug 12, 2021
Updated
Aug 10, 2026
Vendor
Microsoft
Product
Windows 10 Version 1507
Classifications
CWE-190, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 12, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.10240.0 <10.0.10240.19022

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows 10 Version 1507version=10.0.10240.0 <10.0.10240.19022
Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.2114
Microsoft · Windows 10 Version 21H1version=10.0.0 <10.0.19043.1165
Microsoft · Windows 10 Version 1909version=10.0.0 <10.0.18363.1734
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.4583
Microsoft · Windows Server, version 2004version=10.0.0 <10.0.19041.1165
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.4583
Microsoft · Windows 10 Version 20H2version=10.0.0 <10.0.19042.1165
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.2114
Microsoft · Windows Server version 20H2version=10.0.0 <10.0.19042.1165
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.4583
Microsoft · Windows 10 Version 2004version=10.0.0 <10.0.19041.1165
Microsoft · Windows 10 Version 1809version=10.0.0 <10.0.17763.2114; version=10.0.17763.0 <10.0.17763.2114

Published CVSS scores

4.6NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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