OnlyPatch
Kerberos

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

Important CVSS 6.5 EPSS 0.05786 2019-06 archive

Executive Summary

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.

Overview

6.5
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Denial of Service
Released Jun 11 2019
Last Updated Jun 11 2019
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.05786 — 0.92308 percentile
NVD CVSS 6.5 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
None
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Reasonable
Temporal Score: 5.6

EPSS Score

0.05786
probability of exploitation in the next 30 days
0.92308 percentile - updated 2026-07-25
View on FIRST.org

Affected Products

25 affected products
Product KB Article Severity Impact Restart Required
Windows 10 for 32-bit Systems 4503291 (Security Update) Important Denial of Service Yes
Windows 10 for x64-based Systems 4503291 (Security Update) Important Denial of Service Yes
Windows 10 Version 1607 for 32-bit Systems 4503267 (Security Update) Important Denial of Service Yes
Windows 10 Version 1607 for x64-based Systems 4503267 (Security Update) Important Denial of Service Yes
Windows 10 Version 1703 for 32-bit Systems 4503279 (Security Update) Important Denial of Service Yes
Windows 10 Version 1703 for x64-based Systems 4503279 (Security Update) Important Denial of Service Yes
Windows 10 Version 1709 for 32-bit Systems 4503284 (Security Update) Important Denial of Service Yes
Windows 10 Version 1709 for ARM64-based Systems 4503284 (Security Update) Important Denial of Service Yes
Windows 10 Version 1709 for x64-based Systems 4503284 (Security Update) Important Denial of Service Yes
Windows 10 Version 1803 for 32-bit Systems 4503286 (Security Update) Important Denial of Service Yes
Windows 10 Version 1803 for ARM64-based Systems 4503286 (Security Update) Important Denial of Service Yes
Windows 10 Version 1803 for x64-based Systems 4503286 (Security Update) Important Denial of Service Yes
Windows 10 Version 1809 for 32-bit Systems 4503327 (Security Update) Important Denial of Service Yes
Windows 10 Version 1809 for ARM64-based Systems 4503327 (Security Update) Important Denial of Service Yes
Windows 10 Version 1809 for x64-based Systems 4503327 (Security Update) Important Denial of Service Yes
Windows 10 Version 1903 for 32-bit Systems 4503293 (Security Update) Important Denial of Service Yes
Windows 10 Version 1903 for ARM64-based Systems 4503293 (Security Update) Important Denial of Service Yes
Windows 10 Version 1903 for x64-based Systems 4503293 (Security Update) Important Denial of Service No
Windows 7 for 32-bit Systems Service Pack 1 4503292 (Monthly Rollup) 4503269 (Security Only) Important Denial of Service 4499164 Base: 6.5 Temporal: 5.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R Yes None Windows 7 for x64-based Systems Service Pack 1 4503292 (Monthly Rollup) 4503269 (Security Only) Important Denial of Service 4499164 Base: 6.5 Temporal: 5.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R Yes None Windows 8.1 for 32-bit systems 4503276 (Monthly Rollup) 4503290 (Security Only) Important Denial of Service 4499151 Base: 6.5 Temporal: 5.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R Yes None Windows 8.1 for x64-based systems 4503276 (Monthly Rollup) 4503290 (Security Only) Important Denial of Service 4499151 Base: 6.5 Temporal: 5.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R Yes None Windows RT 8.1 4503276 (Monthly Rollup) Important Denial of Service Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 4503273 (Monthly Rollup) 4503287 (Security Only) Important Denial of Service 4499149 Base: 6.5 Temporal: 5.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R Yes None Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 4503273 (Monthly Rollup) 4503287 (Security Only) Important Denial of Service 4499149 Base: 6.5 Temporal: 5.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R Yes None Windows Server 2008 for Itanium-Based Systems Service Pack 2 4503273 (Monthly Rollup) 4503287 (Security Only) Important Denial of Service 4499149 Base: 6.5 Temporal: 5.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R Yes None Windows Server 2008 for x64-based Systems Service Pack 2 4503273 (Monthly Rollup) 4503287 (Security Only) Important Denial of Service 4499149 Base: 6.5 Temporal: 5.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R Yes None Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4503273 (Monthly Rollup) 4503287 (Security Only) Important Denial of Service 4499149 Base: 6.5 Temporal: 5.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R Yes None Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 4503292 (Monthly Rollup) 4503269 (Security Only) Important Denial of Service 4499164 Base: 6.5 Temporal: 5.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 4503292 (Monthly Rollup) 4503269 (Security Only) Important Denial of Service 4499164 Base: 6.5 Temporal: 5.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4503292 (Monthly Rollup) 4503269 (Security Only) Important Denial of Service 4499164 Base: 6.5 Temporal: 5.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R Yes None Windows Server 2012 4503285 (Monthly Rollup) 4503263 (Security Only) Important Denial of Service 4499171 Base: 6.5 Temporal: 5.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R Yes None Windows Server 2012 (Server Core installation) 4503285 (Monthly Rollup) 4503263 (Security Only) Important Denial of Service 4499171 Base: 6.5 Temporal: 5.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R Yes None Windows Server 2012 R2 4503276 (Monthly Rollup) 4503290 (Security Only) Important Denial of Service 4499151 Base: 6.5 Temporal: 5.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R Yes None Windows Server 2012 R2 (Server Core installation) 4503276 (Monthly Rollup) 4503290 (Security Only) Important Denial of Service 4499151 Base: 6.5 Temporal: 5.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R Yes None Windows Server 2016 4503267 (Security Update) Important Denial of Service Yes
Windows Server 2016 (Server Core installation) 4503267 (Security Update) Important Denial of Service Yes
Windows Server 2019 4503327 (Security Update) Important Denial of Service Yes
Windows Server 2019 (Server Core installation) 4503327 (Security Update) Important Denial of Service Yes
Windows Server, version 1803 (Server Core Installation) 4503286 (Security Update) Important Denial of Service Yes
Windows Server, version 1903 (Server Core installation) 4503293 (Security Update) Important Denial of Service No

Patches

8 patches
Article Type Restart
4503291 Security Update Yes
4503267 Security Update Yes
4503279 Security Update Yes
4503284 Security Update Yes
4503286 Security Update Yes
4503327 Security Update Yes
4503293 Security Update Yes
4503276 Monthly Rollup Yes

Known Exploits

Acknowledgments

Danyal Drew of The Missing Link

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