CVE-2021-28356 — Remote Procedure Call Runtime Remote Code Execution Vulnerability

Executive Summary

None

Overview

8.8

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Remote Code Execution

Released Apr 13 2021

Last Updated Apr 13 2021

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.02536 — 0.82896 percentile

NVD CVSS 8.8 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 7.7

EPSS Score

0.02536

probability of exploitation in the next 30 days

0.82896 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

27 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 for 32-bit Systems	`5001340 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 for x64-based Systems	`5001340 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1607 for 32-bit Systems	`5001347 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1607 for x64-based Systems	`5001347 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1803 for 32-bit Systems	`5001339 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1803 for ARM64-based Systems	`5001339 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1803 for x64-based Systems	`5001339 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1809 for 32-bit Systems	`5001342 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1809 for ARM64-based Systems	`5001342 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1809 for x64-based Systems	`5001342 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1909 for 32-bit Systems	`5001337 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1909 for ARM64-based Systems	`5001337 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 1909 for x64-based Systems	`5001337 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 2004 for 32-bit Systems	`5001330 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 2004 for ARM64-based Systems	`5001330 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 2004 for x64-based Systems	`5001330 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 20H2 for 32-bit Systems	`5001330 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 20H2 for ARM64-based Systems	`5001330 (Security Update)`	Important	Remote Code Execution	Yes
Windows 10 Version 20H2 for x64-based Systems	`5001330 (Security Update)`	Important	Remote Code Execution	Yes
Windows 7 for 32-bit Systems Service Pack 1 5001335 (Monthly Rollup) 5001392 (Security Only) Important Remote Code Execution 5000841 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 5001335 5001392 Windows 7 for x64-based Systems Service Pack 1 5001335 (Monthly Rollup) 5001392 (Security Only) Important Remote Code Execution 5000841 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 5001335 5001392 Windows 8.1 for 32-bit systems 5001382 (Monthly Rollup) 5001393 (Security Only) Important Remote Code Execution 5000848 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 5001382 5001393 Windows 8.1 for x64-based systems 5001382 (Monthly Rollup) 5001393 (Security Only) Important Remote Code Execution 5000848 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 5001382 5001393 Windows RT 8.1	`5001382 (Monthly Rollup)`	Important	Remote Code Execution	Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 5001389 (Monthly Rollup) 5001332 (Security Only) Important Remote Code Execution 5000844 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 5001389 5001332 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5001389 (Monthly Rollup) 5001332 (Security Only) Important Remote Code Execution 5000844 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 5001389 5001332 Windows Server 2008 for x64-based Systems Service Pack 2 5001389 (Monthly Rollup) 5001332 (Security Only) Important Remote Code Execution 5000844 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 5001389 5001332 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5001389 (Monthly Rollup) 5001332 (Security Only) Important Remote Code Execution 5000844 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 5001389 5001332 Windows Server 2008 R2 for x64-based Systems Service Pack 1 5001335 (Monthly Rollup) 5001392 (Security Only) Important Remote Code Execution 5000841 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 5001335 5001392 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5001335 (Monthly Rollup) 5001392 (Security Only) Important Remote Code Execution 5000841 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 5001335 5001392 Windows Server 2012 5001387 (Monthly Rollup) 5001383 (Security Only) Important Remote Code Execution 5000847 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 5001387 5001383 Windows Server 2012 (Server Core installation) 5001387 (Monthly Rollup) 5001383 (Security Only) Important Remote Code Execution 5000847 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 5001387 5001383 Windows Server 2012 R2 5001382 (Monthly Rollup) 5001393 (Security Only) Important Remote Code Execution 5000848 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 5001382 5001393 Windows Server 2012 R2 (Server Core installation) 5001382 (Monthly Rollup) 5001393 (Security Only) Important Remote Code Execution 5000848 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 5001382 5001393 Windows Server 2016	`5001347 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2016 (Server Core installation)	`5001347 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2019	`5001342 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server 2019 (Server Core installation)	`5001342 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server, version 1909 (Server Core installation)	`5001337 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server, version 2004 (Server Core installation)	`5001330 (Security Update)`	Important	Remote Code Execution	Yes
Windows Server, version 20H2 (Server Core Installation)	`5001330 (Security Update)`	Important	Remote Code Execution	Yes

Patches

7 patches

Article	Type	Restart
`5001340`	Security Update	Yes
`5001347`	Security Update	Yes
`5001339`	Security Update	Yes
`5001342`	Security Update	Yes
`5001337`	Security Update	Yes
`5001330`	Security Update	Yes
`5001382`	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

Yuki Chen

References

MSRC Advisory MITRE NVD