OnlyFm252
Windows DCOM Server

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 — 0.98754 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
0.98754 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 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

Acknowledgments

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

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