CVE-2021-26414 — Windows DCOM Server Security Feature Bypass

Important CVSS 4.8 EPSS 0.4997 2021-07 archive

Executive Summary

None

Overview

4.8

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Security Feature Bypass

Released Jul 13 2021

Last Updated Jul 13 2021

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.4997 — 0.98799 percentile

NVD CVSS 4.8 MEDIUM — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Network

ATTACK COMPLEXITY

High

PRIVILEGES REQUIRED

Low

USER INTERACTION

Required

SCOPE

Unchanged

CONFIDENTIALITY

None

INTEGRITY

High

AVAILABILITY

None

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 4.2

EPSS Score

0.4997

probability of exploitation in the next 30 days

0.98799 percentile - updated 2026-08-14

View on FIRST.org

Affected Products

27 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 for 32-bit Systems	`5023787 (ServicingStackUpdate)`	Important	Security Feature Bypass	Yes
Windows 10 for x64-based Systems	`5023787 (ServicingStackUpdate)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1607 for 32-bit Systems	`5023697 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1607 for x64-based Systems	`5023697 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1809 for 32-bit Systems	`5023702 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1809 for ARM64-based Systems	`5023702 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1809 for x64-based Systems	`5023702 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1909 for 32-bit Systems	`5014701 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1909 for ARM64-based Systems	`5014701 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1909 for x64-based Systems	`5014701 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 20H2 for 32-bit Systems	`5023696 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 20H2 for ARM64-based Systems	`5023696 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 21H1 for 32-bit Systems	`5014699 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 21H1 for ARM64-based Systems	`5014699 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 21H1 for x64-based Systems	`5014699 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 21H2 for 32-bit Systems	`5023696 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 21H2 for ARM64-based Systems	`5023696 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 21H2 for x64-based Systems	`5023696 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 11 version 21H2 for ARM64-based Systems	`5023698 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 11 version 21H2 for x64-based Systems	`5023698 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 7 for 32-bit Systems Service Pack 1 5014748 (Monthly Rollup) 5014742 (Security Only) Important Security Feature Bypass 5014012 Base: 4.8 Temporal: 4.2 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 6.1.7601.25984 Yes 5014748 5014742 Windows 7 for x64-based Systems Service Pack 1 5014748 (Monthly Rollup) 5014742 (Security Only) Important Security Feature Bypass 5014012 Base: 4.8 Temporal: 4.2 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 6.1.7601.25984 Yes 5014748 5014742 Windows 8.1 for 32-bit systems 5014738 (Monthly Rollup) 5014746 (Security Only) Important Security Feature Bypass 5014011 Base: 4.8 Temporal: 4.2 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 6.3.9600.20402 Yes 5014738 5014746 Windows 8.1 for x64-based systems 5014738 (Monthly Rollup) 5014746 (Security Only) Important Security Feature Bypass 5014011 Base: 4.8 Temporal: 4.2 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 6.3.9600.20402 Yes 5014738 5014746 Windows RT 8.1	`5014738 (Monthly Rollup)`	Important	Security Feature Bypass	Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 5023755 (Monthly Rollup) 5023754 (Security Only) Important Security Feature Bypass 5022890 Base: 4.8 Temporal: 4.2 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 6.0.6003.21966 Yes 5023755 5023754 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5023755 (Monthly Rollup) 5023754 (Security Only) Important Security Feature Bypass 5022890 Base: 4.8 Temporal: 4.2 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 6.0.6003.21966 Yes 5023755 5023754 Windows Server 2008 for x64-based Systems Service Pack 2 5023755 (Monthly Rollup) 5023754 (Security Only) Important Security Feature Bypass 5022890 Base: 4.8 Temporal: 4.2 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 6.0.6003.21966 Yes 5023755 5023754 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5023755 (Monthly Rollup) 5023754 (Security Only) Important Security Feature Bypass 5022890 Base: 4.8 Temporal: 4.2 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 6.0.6003.21966 Yes 5023755 5023754 Windows Server 2008 R2 for x64-based Systems Service Pack 1 5023769 (Monthly Rollup) 5023759 (Security Only) Important Security Feature Bypass 5022874 Base: 4.8 Temporal: 4.2 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 6.1.7601.26415 Yes 5023769 5023759 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5023769 (Monthly Rollup) 5023759 (Security Only) Important Security Feature Bypass 5022874 Base: 4.8 Temporal: 4.2 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 6.1.7601.26415 Yes 5023769 5023759 Windows Server 2012 5023756 (Monthly Rollup) 5023752 (Security Only) Important Security Feature Bypass 5022903 Base: 4.8 Temporal: 4.2 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 6.2.9200.24168 Yes 5023756 5023752 Windows Server 2012 (Server Core installation) 5023756 (Monthly Rollup) 5023752 (Security Only) Important Security Feature Bypass 5022903 Base: 4.8 Temporal: 4.2 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 6.2.9200.24168 Yes 5023756 5023752 Windows Server 2012 R2 5023765 (Monthly Rollup) 5023764 (Security Only) Important Security Feature Bypass 5022899 Base: 4.8 Temporal: 4.2 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 6.3.9600.20865 Yes None Windows Server 2012 R2 (Server Core installation) 5023765 (Monthly Rollup) 5023764 (Security Only) Important Security Feature Bypass 5022899 Base: 4.8 Temporal: 4.2 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 6.3.9600.20865 Yes None Windows Server 2016	`5023697 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2016 (Server Core installation)	`5023697 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2019	`5023702 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2019 (Server Core installation)	`5023702 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2022	`5023705 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2022 (Server Core installation)	`5023705 (Security Update)`	Important	Security Feature Bypass	Yes

Patches

9 patches

Article	Type	Restart
`5023787`	ServicingStackUpdate	Yes
`5023697`	Security Update	Yes
`5023702`	Security Update	Yes
`5014701`	Security Update	Yes
`5023696`	Security Update	Yes
`5014699`	Security Update	Yes
`5023698`	Security Update	Yes
`5014738`	Monthly Rollup	Yes
`5023705`	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

Dlive (https://twitter.com/D1iv3) of Tencent Security Xuanwu Lab

References

MSRC Advisory MITRE NVD

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