Elevation of Privilege Vulnerability in Microsoft Windows Local Security Authority
CVE-2025-21191

7HIGH

Key Information:

Vendor

Microsoft
Status
Windows Server 2025
Windows Server 2025 (server Core Installation)
Windows 10 Version 1809
Windows Server 2019
Vendor
CVE Published:
8 April 2025

What is CVE-2025-21191?

A time-of-check to time-of-use (TOCTOU) race condition exists in Microsoft's Local Security Authority (LSA), which may allow an attacker with local access to elevate privileges. By exploiting this vulnerability, an authorized user could potentially gain greater control over the affected system than initially intended, compromising system security.

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Affected Version(s)

Windows 10 Version 1507 32-bit Systems 10.0.10240.0 < 10.0.10240.20978

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.7969

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.7136

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisory

CVSS V3.1

Score:
7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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