CVE-2020-1033 — Windows Kernel Information Disclosure Vulnerability

Executive Summary

An information disclosure vulnerability exists when the Windows kernel improperly handles objects in memory. An attacker who successfully exploited this vulnerability could obtain information to further compromise the user’s system. An authenticated attacker could exploit this vulnerability by running a specially crafted application. The update addresses the vulnerability by correcting how the Windows kernel handles objects in memory.

Overview

4

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Information Disclosure

Released Sep 8 2020

Last Updated Sep 8 2020

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.01159 — 0.62971 percentile

NVD CVSS 4 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

ATTACK VECTOR

Local

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

Low

INTEGRITY

None

AVAILABILITY

None

Temporal Score: 4.0

EPSS Score

0.01159

probability of exploitation in the next 30 days

0.62971 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

24 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 1709 for 32-bit Systems	`4577041 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1709 for ARM64-based Systems	`4577041 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1709 for x64-based Systems	`4577041 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1803 for 32-bit Systems	`4577032 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1803 for ARM64-based Systems	`4577032 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1803 for x64-based Systems	`4577032 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for 32-bit Systems	`4570333 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for ARM64-based Systems	`4570333 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for x64-based Systems	`4570333 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1903 for 32-bit Systems	`4574727 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1903 for ARM64-based Systems	`4574727 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1903 for x64-based Systems	`4574727 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1909 for 32-bit Systems	`4574727 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1909 for ARM64-based Systems	`4574727 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1909 for x64-based Systems	`4574727 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 2004 for 32-bit Systems	`4571756 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 2004 for ARM64-based Systems	`4571756 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 2004 for x64-based Systems	`4571756 (Security Update)`	Important	Information Disclosure	Yes
Windows 8.1 for 32-bit systems 4577066 (Monthly Rollup) 4577071 (Security Only) Important Information Disclosure 4571703 Base: 4.0 Temporal: 3.6 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes 4577066 4577071 4577066 Windows 8.1 for x64-based systems 4577066 (Monthly Rollup) 4577071 (Security Only) Important Information Disclosure 4571703 Base: 4.0 Temporal: 3.6 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C Yes 4577066 4577071 4577066 Windows RT 8.1	`4577066 (Monthly Rollup)`	Important	Information Disclosure	Yes
Windows Server 2012 R2 4577066 (Monthly Rollup) 4577071 (Security Only) Important Information Disclosure 4571703 Base: 4.0 Temporal: 3.6 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C Yes 4577066 4577071 4577066 Windows Server 2012 R2 (Server Core installation) 4577066 (Monthly Rollup) 4577071 (Security Only) Important Information Disclosure 4571703 Base: 4.0 Temporal: 3.6 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C Yes 4577066 4577071 4577066 Windows Server 2019	`4570333 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2019 (Server Core installation)	`4570333 (Security Update)`	Important	Information Disclosure	Yes
Windows Server, version 1903 (Server Core installation)	`4574727 (Security Update)`	Important	Information Disclosure	Yes
Windows Server, version 1909 (Server Core installation)	`4574727 (Security Update)`	Important	Information Disclosure	Yes
Windows Server, version 2004 (Server Core installation)	`4571756 (Security Update)`	Important	Information Disclosure	Yes

Patches

6 patches

Article	Type	Restart
`4577041`	Security Update	Yes
`4577032`	Security Update	Yes
`4570333`	Security Update	Yes
`4574727`	Security Update	Yes
`4571756`	Security Update	Yes
`4577066`	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

Microsoft Product Security & Vulnerability Research

References

MSRC Advisory MITRE NVD