CVE-2019-1091 — Microsoft unistore.dll Information Disclosure Vulnerability

Executive Summary

An information disclosure vulnerability exists when Unistore.dll fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could potentially disclose memory contents of an elevated process. To exploit this vulnerability, an authenticated attacker could run a specially crafted application in user mode. The update addresses the vulnerability by correcting how the Unistore.dll handles objects in memory.

Overview

5.5

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Information Disclosure

Released Jul 9 2019

Last Updated Jul 9 2019

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.0199 — 0.78061 percentile

CVSS Vector

ATTACK VECTOR

Local

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

Temporal Score: 5.0

EPSS Score

0.0199

probability of exploitation in the next 30 days

0.78061 percentile - updated 2026-06-20

View on FIRST.org

Affected Products

24 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 for 32-bit Systems	`4507458 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 for x64-based Systems	`4507458 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1607 for 32-bit Systems	`4507460 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1607 for x64-based Systems	`4507460 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1703 for 32-bit Systems	`4507450 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1703 for x64-based Systems	`4507450 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1709 for 32-bit Systems	`4507455 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1709 for ARM64-based Systems	`4507455 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1709 for x64-based Systems	`4507455 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1803 for 32-bit Systems	`4507435 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1803 for ARM64-based Systems	`4507435 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1803 for x64-based Systems	`4507435 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for 32-bit Systems	`4507469 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for ARM64-based Systems	`4507469 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for x64-based Systems	`4507469 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1903 for 32-bit Systems	`4507453 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1903 for ARM64-based Systems	`4507453 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1903 for x64-based Systems	`4507453 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2016	`4507460 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2016 (Server Core installation)	`4507460 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2019	`4507469 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2019 (Server Core installation)	`4507469 (Security Update)`	Important	Information Disclosure	Yes
Windows Server, version 1803 (Server Core Installation)	`4507435 (Security Update)`	Important	Information Disclosure	Yes
Windows Server, version 1903 (Server Core installation)	`4507453 (Security Update)`	Important	Information Disclosure	Yes

Patches

7 patches

Article	Type	Restart
`4507458`	Security Update	Yes
`4507460`	Security Update	Yes
`4507450`	Security Update	Yes
`4507455`	Security Update	Yes
`4507435`	Security Update	Yes
`4507469`	Security Update	Yes
`4507453`	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

Qihoo 360 Vulcan Team

References

MSRC Advisory MITRE NVD