Microsoft Windows
CVE-2020-1267 — Local Security Authority Subsystem Service Denial of Service Vulnerability
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
4.9
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
High
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
None
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 4.4
EPSS Score
0.04532
probability of exploitation in the next 30 days
0.90326 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
30 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 4565513 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 for x64-based Systems | 4565513 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4565511 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4565511 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1709 for 32-bit Systems | 4565508 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1709 for ARM64-based Systems | 4565508 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1709 for x64-based Systems | 4565508 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4565489 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4565489 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4565489 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4558998 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4558998 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4558998 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1903 for 32-bit Systems | 4565483 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1903 for ARM64-based Systems | 4565483 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1903 for x64-based Systems | 4565483 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1909 for 32-bit Systems | 4565483 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1909 for ARM64-based Systems | 4565483 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1909 for x64-based Systems | 4565483 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 2004 for 32-bit Systems | 4565503 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 2004 for ARM64-based Systems | 4565503 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 2004 for x64-based Systems | 4565503 (Security Update) |
Important | Denial of Service | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 4565524 (Monthly Rollup) 4565539 (Security Only) Important Denial of Service 4561643 Base: 4.9 Temporal: 4.4 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4565524 4565539 Windows 7 for x64-based Systems Service Pack 1 4565524 (Monthly Rollup) 4565539 (Security Only) Important Denial of Service 4561643 Base: 4.9 Temporal: 4.4 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4565524 4565539 Windows 8.1 for 32-bit systems 4565541 (Monthly Rollup) 4565540 (Security Only) Important Denial of Service 4561666 Base: 4.9 Temporal: 4.4 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4565541 4565540 4565541 Windows 8.1 for x64-based systems 4565541 (Monthly Rollup) 4565540 (Security Only) Important Denial of Service 4561666 Base: 4.9 Temporal: 4.4 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4565541 4565540 4565541 Windows RT 8.1 | 4565541 (Monthly Rollup) |
Important | Denial of Service | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 4565536 (Monthly Rollup) 4565529 (Security Only) Important Denial of Service 4561670 Base: 4.9 Temporal: 4.4 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4565536 4565529 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 4565536 (Monthly Rollup) 4565529 (Security Only) Important Denial of Service 4561670 Base: 4.9 Temporal: 4.4 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4565536 4565529 Windows Server 2008 for x64-based Systems Service Pack 2 4565536 (Monthly Rollup) 4565529 (Security Only) Important Denial of Service 4561670 Base: 4.9 Temporal: 4.4 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4565536 4565529 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4565536 (Monthly Rollup) 4565529 (Security Only) Important Denial of Service 4561670 Base: 4.9 Temporal: 4.4 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4565536 4565529 Windows Server 2008 R2 for x64-based Systems Service Pack 1 4565524 (Monthly Rollup) 4565539 (Security Only) Important Denial of Service 4561643 Base: 4.9 Temporal: 4.4 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4565524 4565539 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4565524 (Monthly Rollup) 4565539 (Security Only) Important Denial of Service 4561643 Base: 4.9 Temporal: 4.4 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4565524 4565539 Windows Server 2012 4565537 (Monthly Rollup) 4565535 (Security Only) Important Denial of Service 4561612 Base: 4.9 Temporal: 4.4 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4565537 4565535 Windows Server 2012 (Server Core installation) 4565537 (Monthly Rollup) 4565535 (Security Only) Important Denial of Service 4561612 Base: 4.9 Temporal: 4.4 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4565537 4565535 Windows Server 2012 R2 4565541 (Monthly Rollup) 4565540 (Security Only) Important Denial of Service 4561666 Base: 4.9 Temporal: 4.4 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4565541 4565540 4565541 Windows Server 2012 R2 (Server Core installation) 4565541 (Monthly Rollup) 4565540 (Security Only) Important Denial of Service 4561666 Base: 4.9 Temporal: 4.4 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4565541 4565540 4565541 Windows Server 2016 | 4565511 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server 2016 (Server Core installation) | 4565511 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server 2019 | 4558998 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server 2019 (Server Core installation) | 4558998 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server, version 1903 (Server Core installation) | 4565483 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server, version 1909 (Server Core installation) | 4565483 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server, version 2004 (Server Core installation) | 4565503 (Security Update) |
Important | Denial of Service | Yes |
Patches
8 patches
| Article | Type | Restart |
|---|---|---|
4565513 |
Security Update | Yes |
4565511 |
Security Update | Yes |
4565508 |
Security Update | Yes |
4565489 |
Security Update | Yes |
4558998 |
Security Update | Yes |
4565483 |
Security Update | Yes |
4565503 |
Security Update | Yes |
4565541 |
Monthly Rollup | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
References
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