CVE-2019-1440 — Win32k Information Disclosure Vulnerability

Executive Summary

An information disclosure vulnerability exists when the win32k component improperly provides kernel information. An attacker who successfully exploited the vulnerability could obtain information to further compromise the user’s system. To exploit this vulnerability, an attacker would have to log on to an affected system and run a specially crafted application. The security update addresses the vulnerability by correcting how win32k handles objects in memory.

Overview

5

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Information Disclosure

Released Nov 12 2019

Last Updated Nov 12 2019

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.02077 — 0.79037 percentile

CVSS Vector

ATTACK VECTOR

Local

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

Required

SCOPE

Unchanged

Temporal Score: 4.5

EPSS Score

0.02077

probability of exploitation in the next 30 days

0.79037 percentile - updated 2026-06-20

View on FIRST.org

Affected Products

16 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 1709 for 32-bit Systems	`4525241 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1709 for ARM64-based Systems	`4525241 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1709 for x64-based Systems	`4525241 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1803 for 32-bit Systems	`4525237 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1803 for ARM64-based Systems	`4525237 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1803 for x64-based Systems	`4525237 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for 32-bit Systems	`4523205 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for ARM64-based Systems	`4523205 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for x64-based Systems	`4523205 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1903 for 32-bit Systems	`4524570 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1903 for ARM64-based Systems	`4524570 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1903 for x64-based Systems	`4524570 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2019	`4523205 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2019 (Server Core installation)	`4523205 (Security Update)`	Important	Information Disclosure	Yes
Windows Server, version 1803 (Server Core Installation)	`4525237 (Security Update)`	Important	Information Disclosure	Yes
Windows Server, version 1903 (Server Core installation)	`4524570 (Security Update)`	Important	Information Disclosure	Yes

Patches

4 patches

Article	Type	Restart
`4525241`	Security Update	Yes
`4525237`	Security Update	Yes
`4523205`	Security Update	Yes
`4524570`	Security Update	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

Gil Dabah

References

MSRC Advisory MITRE NVD