CVE-2021-26901

Local privilege escalation via Event Tracing

Published Mar 11, 2021 · Updated Aug 19, 2026

Windows Event Tracing elevation of privilege in Microsoft Windows allows local users to gain higher privileges via an undisclosed Event Tracing flaw. The vulnerability affects low-privilege local users and can compromise confidentiality, integrity, and availability; Microsoft has not publicly described the vulnerable operation beyond the Event Tracing component. Exploitation requires local access and no user interaction.

CVSS severity7.8
High
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Windows Event Tracing elevation of privilege in Microsoft Windows allows local users to gain higher privileges via an undisclosed Event Tracing flaw. The vulnerability affects low-privilege local users and can compromise confidentiality, integrity, and availability; Microsoft has not publicly described the vulnerable operation beyond the Event Tracing component. Exploitation requires local access and no user interaction.

The record

CVE
CVE-2021-26901
Published
Mar 11, 2021
Updated
Aug 19, 2026
Vendor
Microsoft
Product
Windows 10 Version 1507
Classifications
CWE-269, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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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 <10.0.10240.18874

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows 10 Version 1507version=10.0.10240.0 <10.0.10240.18874
Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.1817
Microsoft · Windows 7version=6.1.0 <6.1.7601.24566
Microsoft · Windows 10 Version 1909version=10.0.0 <10.0.18363.1440
Microsoft · Windows 10 Version 1803version=10.0.0 <10.0.17134.2087
Microsoft · Windows 8.1version=6.3.0 <6.3.9600.19968
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.4283
Microsoft · Windows Server 2012 (Server Core installation)version=6.2.9200.0 <6.2.9200.23298
Microsoft · Windows Server 2012version=6.2.9200.0 <6.2.9200.23298
Microsoft · Windows Server, version 2004version=10.0.0 <10.0.19043.867
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.4283
Microsoft · Windows Server 2008 R2 Service Pack 1version=6.1.7601.0 <6.1.7601.24566
Microsoft · Windows 10 Version 20H2version=10.0.0 <10.0.19043.867
Microsoft · Windows Server 2008 R2 Service Pack 1 (Server Core installation)version=6.1.7601.0 <6.1.7601.24566
Microsoft · Windows Server 2012 R2 (Server Core installation)version=6.3.9600.0 <6.3.9600.19968
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.1817
Microsoft · Windows 7 Service Pack 1version=6.1.0 <6.1.7601.24566
Microsoft · Windows Server version 20H2version=10.0.0 <10.0.19043.867
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.4283
Microsoft · Windows Server 2008 Service Pack 2version=6.0.6003.0 <6.0.6003.21070
Microsoft · Windows 10 Version 2004version=10.0.0 <10.0.19043.867
Microsoft · Windows 10 Version 1809version=10.0.0 <10.0.17763.1817; version=10.0.17763.0 <10.0.17763.1817
Microsoft · Windows Server 2012 R2version=6.3.9600.0 <6.3.9600.19968
Microsoft · Windows Server 2008 Service Pack 2 (Server Core installation)version=6.0.6003.0 <6.0.6003.21070
Microsoft · Windows Server, version 1909 (Server Core installation)version=10.0.0 <10.0.18363.1440

Published CVSS scores

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

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 exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
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.

Technologies

Your stack

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Your stack

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