What’s Vulnerable › Vulnerabilities

CVE-2019-0972: Local Security Authority Subsystem Service Denial of Service Vulnerability

• Severity: medium (CVSS 6.8 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-06-12 · updated 2026-06-17

Description

This security update corrects a denial of service in the Local Security Authority Subsystem Service (LSASS) caused when an authenticated attacker sends a specially crafted authentication request. A remote attacker who successfully exploited this vulnerability could cause a denial of service on the target system's LSASS service, which triggers an automatic reboot of the system. The security update addresses the vulnerability by changing the way that LSASS handles specially crafted authentication requests.

Affected products

• Microsoft Windows 10 Version 1607: 1607, 1703, 1709, 1803, 1809, 1903
• Microsoft Windows 7: all versions
• Microsoft Windows 8.1: all versions
• Microsoft Windows RT 8.1: all versions
• Microsoft Windows Server 2008: r2-sp1
• Microsoft Windows Server 2012: r2
• Microsoft Windows Server 2016: 1803, 1903
• Microsoft Windows Server 2019: all versions
• Microsoft Windows 10 Version 1507: from 10.0.10240.0 before publication — fixed in publication
• Microsoft Windows 10 1607: from 10.0.14393.0 before publication — fixed in publication
• Microsoft Corporation Windows 10 1703: from 10.0.0 before publication — fixed in publication
• Microsoft Windows 10 1709: from 10.0.0 before publication — fixed in publication
• Microsoft Windows 10 Version 1709 for 32-bit Systems: from 10.0.0 before publication — fixed in publication
• Microsoft Windows 10 1803: from 10.0.0 before publication — fixed in publication
• Microsoft Windows 10: from 10.0.17763.0 before publication — fixed in publication
• Microsoft Windows 10 Version 1903 for 32-bit Systems: from 10.0.0 before publication — fixed in publication
• Microsoft Windows 10 Version 1903 for ARM64-based Systems: from 10.0.0 before publication — fixed in publication
• Microsoft Windows 10 Version 1903 for x64-based Systems: from 10.0.0 before publication — fixed in publication
• Microsoft Windows 7: from 6.1.0 before publication — fixed in publication
• Microsoft Windows 7 Service Pack 1: from 6.1.0 before publication — fixed in publication
• Microsoft Windows 8.1: from 6.3.0 before publication — fixed in publication
• Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0 before publication — fixed in publication
• Microsoft Windows Server 2008 R2 Systems Service Pack 1: from 6.1.0 before publication — fixed in publication
• Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0 before publication — fixed in publication
• Microsoft Windows Server 2012: from 6.2.9200.0 before publication — fixed in publication
• Microsoft Windows Server 2012 R2: from 6.3.9600.0 before publication — fixed in publication
• Microsoft Windows Server 2016: from 10.0.14393.0 before publication — fixed in publication
• Microsoft Windows Server 2019: from 10.0.17763.0 before publication — fixed in publication
• Microsoft Windows Server, version 1803 (Server Core Installation): from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server, version 1903 (Server Core installation): from 10.0.0 before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 publication; Microsoft Windows 10 1607 publication; Microsoft Corporation Windows 10 1703 publication; Microsoft Windows 10 1709 publication; Microsoft Windows 10 Version 1709 for 32-bit Systems publication; Microsoft Windows 10 1803 publication; Microsoft Windows 10 publication; Microsoft Windows 10 Version 1903 for 32-bit Systems publication; Microsoft Windows 10 Version 1903 for ARM64-based Systems publication; Microsoft Windows 10 Version 1903 for x64-based Systems publication; Microsoft Windows 7 publication; Microsoft Windows 7 Service Pack 1 publication. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-0972
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0972

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