OnlyFm252
Windows TCP/IP

CVE-2021-26424 — Windows TCP/IP Remote Code Execution Vulnerability

Critical CVSS 9.9 EPSS 0.58898 2021-08 archive

Executive Summary

None

Overview

9.9
CVSS CRITICAL
Critical
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
Category Remote Code Execution
Released Aug 10 2021
Last Updated Aug 10 2021
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.58898 — 0.98989 percentile
NVD CVSS 9.9 CRITICAL — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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
Changed
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 8.6

EPSS Score

0.58898
probability of exploitation in the next 30 days
0.98989 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

26 affected products
Product KB Article Severity Impact Restart Required
Windows 10 for 32-bit Systems 5005040 (Security Update) Critical Remote Code Execution Yes
Windows 10 for x64-based Systems 5005040 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1607 for 32-bit Systems 5005043 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1607 for x64-based Systems 5005043 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for 32-bit Systems 5005030 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for ARM64-based Systems 5005030 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for x64-based Systems 5005030 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1909 for 32-bit Systems 5005031 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1909 for ARM64-based Systems 5005031 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1909 for x64-based Systems 5005031 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 2004 for 32-bit Systems 5005033 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 2004 for ARM64-based Systems 5005033 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 2004 for x64-based Systems 5005033 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 20H2 for 32-bit Systems 5005033 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 20H2 for ARM64-based Systems 5005033 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 20H2 for x64-based Systems 5005033 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 21H1 for 32-bit Systems 5005033 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 21H1 for ARM64-based Systems 5005033 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 21H1 for x64-based Systems 5005033 (Security Update) Critical Remote Code Execution Yes
Windows 7 for 32-bit Systems Service Pack 1 5005088 (Monthly Rollup) 5005089 (Security Only) Critical Remote Code Execution 5004289 Base: 9.9 Temporal: 8.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.25685 Yes 5005088 5005089 Windows 7 for x64-based Systems Service Pack 1 5005088 (Monthly Rollup) 5005089 (Security Only) Critical Remote Code Execution 5004289 Base: 9.9 Temporal: 8.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.25685 Yes 5005088 5005089 Windows 8.1 for 32-bit systems 5005076 (Monthly Rollup) 5005106 (Security Only) Critical Remote Code Execution 5004298 Base: 9.9 Temporal: 8.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.20094 Yes 5005076 5005106 5005076 Windows 8.1 for x64-based systems 5005076 (Monthly Rollup) 5005106 (Security Only) Critical Remote Code Execution 5004298 Base: 9.9 Temporal: 8.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.20094 Yes 5005076 5005106 5005076 Windows RT 8.1 5005076 (Monthly Rollup) Critical Remote Code Execution Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 5005090 (Monthly Rollup) 5005095 (Security Only) Critical Remote Code Execution 5004305 Base: 9.9 Temporal: 8.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21192 Yes 5005090 5005095 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5005090 (Monthly Rollup) 5005095 (Security Only) Critical Remote Code Execution 5004305 Base: 9.9 Temporal: 8.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21192 Yes 5005090 5005095 Windows Server 2008 for x64-based Systems Service Pack 2 5005090 (Monthly Rollup) 5005095 (Security Only) Critical Remote Code Execution 5004305 Base: 9.9 Temporal: 8.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21192 Yes 5005090 5005095 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5005090 (Monthly Rollup) 5005095 (Security Only) Critical Remote Code Execution 5004305 Base: 9.9 Temporal: 8.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21192 Yes 5005090 5005095 Windows Server 2008 R2 for x64-based Systems Service Pack 1 5005088 (Monthly Rollup) 5005089 (Security Only) Critical Remote Code Execution 5004289 Base: 9.9 Temporal: 8.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.25685 Yes 5005088 5005089 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5005088 (Monthly Rollup) 5005089 (Security Only) Critical Remote Code Execution 5004289 Base: 9.9 Temporal: 8.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.25685 Yes 5005088 5005089 Windows Server 2012 5005099 (Monthly Rollup) 5005094 (Security Only) Critical Remote Code Execution 5004294 Base: 9.9 Temporal: 8.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.2.9200.23435 Yes 5005099 5005094 Windows Server 2012 (Server Core installation) 5005099 (Monthly Rollup) 5005094 (Security Only) Critical Remote Code Execution 5004294 Base: 9.9 Temporal: 8.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.2.9200.23435 Yes 5005099 5005094 Windows Server 2012 R2 5005076 (Monthly Rollup) 5005106 (Security Only) Critical Remote Code Execution 5004298 Base: 9.9 Temporal: 8.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.20094 Yes 5005076 5005106 5005076 Windows Server 2012 R2 (Server Core installation) 5005076 (Monthly Rollup) 5005106 (Security Only) Critical Remote Code Execution 5004298 Base: 9.9 Temporal: 8.6 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.20094 Yes 5005076 5005106 5005076 Windows Server 2016 5005043 (Security Update) Critical Remote Code Execution Yes
Windows Server 2016 (Server Core installation) 5005043 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 5005030 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 (Server Core installation) 5005030 (Security Update) Critical Remote Code Execution Yes
Windows Server, version 2004 (Server Core installation) 5005033 (Security Update) Critical Remote Code Execution Yes
Windows Server, version 20H2 (Server Core Installation) 5005033 (Security Update) Critical Remote Code Execution Yes

Patches

6 patches
Article Type Restart
5005040 Security Update Yes
5005043 Security Update Yes
5005030 Security Update Yes
5005031 Security Update Yes
5005033 Security Update Yes
5005076 Monthly Rollup Yes

Known Exploits

Acknowledgments

Quan Luo from Codesafe Team of Legendsec at Qi'anxin Group

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