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Microsoft Windows

CVE-2019-1380 — Microsoft splwow64 Elevation of Privilege Vulnerability

Important CVSS 7.8 EPSS 0.00754 2019-11 archive

Executive Summary

A local elevation of privilege vulnerability exists in how splwow64.exe handles certain calls. An attacker who successfully exploited the vulnerability could elevate privileges on an affected system from low-integrity to medium-integrity. This vulnerability by itself does not allow arbitrary code execution; however, it could allow arbitrary code to be run if the attacker uses it in combination with another vulnerability (such as a remote code execution vulnerability or another elevation of privilege vulnerability) that is capable of leveraging the elevated privileges when code execution is attempted. The security update addresses the vulnerability by ensuring splwow64.exe properly handles these calls..

Overview

7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Elevation of Privilege
Released Nov 12 2019
Last Updated Nov 12 2019
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.00754 — 0.51315 percentile
NVD CVSS 7.8 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.0

EPSS Score

0.00754
probability of exploitation in the next 30 days
0.51315 percentile - updated 2026-07-25
View on FIRST.org

Affected Products

23 affected products
Product KB Article Severity Impact Restart Required
Windows 10 for 32-bit Systems 4525232 (Security Update) Important Elevation of Privilege Yes
Windows 10 for x64-based Systems 4525232 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1607 for 32-bit Systems 4525236 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1607 for x64-based Systems 4525236 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1709 for 32-bit Systems 4525241 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1709 for ARM64-based Systems 4525241 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1709 for x64-based Systems 4525241 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1803 for 32-bit Systems 4525237 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1803 for ARM64-based Systems 4525237 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1803 for x64-based Systems 4525237 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for 32-bit Systems 4523205 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for ARM64-based Systems 4523205 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for x64-based Systems 4523205 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1903 for 32-bit Systems 4524570 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1903 for ARM64-based Systems 4524570 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1903 for x64-based Systems 4524570 (Security Update) Important Elevation of Privilege Yes
Windows 8.1 for 32-bit systems 4525243 (Monthly Rollup) 4525250 (Security Only) Important Elevation of Privilege 4520005 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows 8.1 for x64-based systems 4525243 (Monthly Rollup) 4525250 (Security Only) Important Elevation of Privilege 4520005 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows RT 8.1 4525243 (Monthly Rollup) Important Elevation of Privilege Yes
Windows Server 2012 4525246 (Monthly Rollup) 4525253 (Security Only) Important Elevation of Privilege 4520007 4519985 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 (Server Core installation) 4525246 (Monthly Rollup) 4525253 (Security Only) Important Elevation of Privilege 4520007 4519985 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 4525243 (Monthly Rollup) 4525250 (Security Only) Important Elevation of Privilege 4520005 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 (Server Core installation) 4525243 (Monthly Rollup) 4525250 (Security Only) Important Elevation of Privilege 4520005 Base: 7.8 Temporal: 7.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2016 4525236 (Security Update) Important Elevation of Privilege Yes
Windows Server 2016 (Server Core installation) 4525236 (Security Update) Important Elevation of Privilege Yes
Windows Server 2019 4523205 (Security Update) Important Elevation of Privilege Yes
Windows Server 2019 (Server Core installation) 4523205 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 1803 (Server Core Installation) 4525237 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 1903 (Server Core installation) 4524570 (Security Update) Important Elevation of Privilege Yes

Patches

7 patches
Article Type Restart
4525232 Security Update Yes
4525236 Security Update Yes
4525241 Security Update Yes
4525237 Security Update Yes
4523205 Security Update Yes
4524570 Security Update Yes
4525243 Monthly Rollup Yes

Known Exploits

Acknowledgments

Anonymous working with Trend Micro's Zero Day Initiative
Wayne Low of Fortinet’s FortiGuard Labs
Keqi Hu from Chengdu Security Response Center of Qihoo 360 Technology Co. Ltd.

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