CVE-2025-21191: Windows Local Security Authority (LSA) Elevation of Privilege Vulnerability
First published: Tue Apr 08 2025(Updated: )
<p>Time-of-check time-of-use (toctou) race condition in Windows Local Security Authority (LSA) allows an authorized attacker to elevate privileges locally.</p>
Credit: secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Windows 11 | =22H2 | |
| Microsoft Windows Server 2012 R2 | ||
| Windows 11 | =23H2 | |
| Microsoft Windows Server 2022 | ||
| Microsoft Windows Server | ||
| Windows 11 | =22H2 | |
| Microsoft Windows Server 2025 | ||
| Microsoft Windows Server 2019 | ||
| Microsoft Windows Server 2016 | ||
| Windows 10 | =21H2 | |
| Windows 10 | =1607 | |
| Microsoft Windows Server | ||
| Windows 10 | =22H2 | |
| Microsoft Windows Server 2022 23H2 | ||
| Microsoft Windows Server 2008 R2 | ||
| Microsoft Windows Server | ||
| Windows 10 | =21H2 | |
| Windows 11 | =24H2 | |
| Microsoft Windows Server 2022 | ||
| Windows 10 | =1809 | |
| Microsoft Windows Server 2008 R2 | ||
| Windows 10 | =1607 | |
| Microsoft Windows Server | ||
| Microsoft Windows Server 2016 | ||
| Windows 10 | =22H2 | |
| Microsoft Windows Server 2025 | ||
| Windows 10 | =22H2 | |
| Windows 10 | =1809 | |
| Windows 11 | =24H2 | |
| Microsoft Windows Server 2012 R2 | ||
| Windows 10 | =21H2 | |
| Microsoft Windows Server | ||
| Microsoft Windows Server | ||
| Windows 11 | =23H2 | |
| Microsoft Windows Server 2019 | ||
| Windows 10 | ||
| Windows 10 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2025-21191?
CVE-2025-21191 is classified as a critical vulnerability due to its potential to allow privilege escalation.
How do I fix CVE-2025-21191?
To fix CVE-2025-21191, install the security patches provided by Microsoft for the affected Windows versions.
Which platforms are affected by CVE-2025-21191?
CVE-2025-21191 affects multiple Windows platforms including Windows 10, Windows 11, Windows Server 2012 R2, and Windows Server 2022.
What type of vulnerability is CVE-2025-21191?
CVE-2025-21191 is a time-of-check time-of-use (TOCTOU) race condition vulnerability.
Can CVE-2025-21191 be exploited remotely?
CVE-2025-21191 cannot be exploited remotely; an authorized attacker must have local access to the system.
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- canonical/windows 10
- canonical/microsoft windows server 2012 r2
- canonical/windows 11
- version/windows 11/22h2
- version/windows 11/23h2
- canonical/microsoft windows server 2022
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- version/windows 10/21h2
- version/windows 10/1607
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- canonical/microsoft windows server 2008 r2
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- version/windows 10/1809