Microsoft · Security update · October 12, 2021

KB5006674: October 2021 cumulative update for Windows 11 21H2

KB5006674, released October 12, 2021, fixes 41 CVEs across 2 products. 3 of them are being exploited (CVE-2021-40449); 3 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.

Patch now3 on CISA KEVKnown ransomware use2 publicly disclosedUnsupported product
CVEs closed
41
2 rated Critical
Exploited
3
CVE-2021-40449
Exploitation more likely
5
Vendor assessment
Highest EPSS
0.8194
99th percentile

Priority of the 41 CVEs

Patch now 3 Urgent 7 High 17 Routine 14

Applies to

ProductBuild after install
Windows 11 version 21H2 for ARM64-based Systems22000.258
Windows 11 version 21H2 for x64-based Systems22000.258

CVEs this fix closes

PriorityCVEComponentImpactCVSSEPSSExploitation
Patch now CVE-2021-40449 Windows Win32K Elevation of Privilege 7.8 0.8194 KEVRansomwareExploited
Patch now CVE-2021-40450 Windows Win32K Elevation of Privilege 7.8 0.0158 KEVExploited
Patch now CVE-2021-41357 Windows Win32K Elevation of Privilege 7.8 0.0158 KEVExploited
Urgent CVE-2021-36970 Windows Print Spooler Components Spoofing 8.8 0.0306 More likely
Urgent CVE-2021-40461 Role: Windows Hyper-V Remote Code Execution 8.0 0.0136 Exploitation Less Likely
Urgent CVE-2021-38672 Role: Windows Hyper-V Remote Code Execution 8.0 0.0109 Exploitation Less Likely
Urgent CVE-2021-40443 Windows Common Log File System Driver Elevation of Privilege 7.8 0.0065 More likely
Urgent CVE-2021-40466 Windows Common Log File System Driver Elevation of Privilege 7.8 0.0065 More likely
Urgent CVE-2021-40470 Windows DirectX Elevation of Privilege 7.8 0.0065 More likely
Urgent CVE-2021-40467 Windows Common Log File System Driver Elevation of Privilege 7.8 0.0054 More likely
High CVE-2021-36953 Windows TCP/IP Denial of Service 7.5 0.0505 Exploitation Less Likely
High CVE-2021-40463 Windows Network Address Translation (NAT) Denial of Service 7.7 0.0258 Exploitation Less Likely
High CVE-2021-40462 Microsoft Windows Codecs Library Remote Code Execution 7.8 0.0252 Exploitation Less Likely
High CVE-2021-40465 Windows Text Shaping Remote Code Execution 7.8 0.0247 Exploitation Less Likely
High CVE-2021-33781 Windows Active Directory Security Feature Bypass 8.1 0.0241 DisclosedExploitation Less Likely
High CVE-2021-40476 Windows AppContainer Elevation of Privilege 7.5 0.0240 Exploitation Less Likely
High CVE-2021-41340 Microsoft Graphics Component Remote Code Execution 7.8 0.0203 Exploitation Less Likely
High CVE-2021-40488 Windows Storage Spaces Controller Elevation of Privilege 7.8 0.0100 Exploitation Less Likely
High CVE-2021-26441 Windows Storage Spaces Controller Elevation of Privilege 7.8 0.0094 Exploitation Less Likely
High CVE-2021-40478 Windows Storage Spaces Controller Elevation of Privilege 7.8 0.0084 Exploitation Less Likely
High CVE-2021-40489 Windows Storage Spaces Controller Elevation of Privilege 7.8 0.0084 Exploitation Less Likely
High CVE-2021-41345 Windows Storage Spaces Controller Elevation of Privilege 7.8 0.0083 Exploitation Less Likely
High CVE-2021-26442 Windows HTTP.sys Elevation of Privilege 7.0 0.0079 Exploitation Less Likely
High CVE-2021-41347 Windows AppX Deployment Service Elevation of Privilege 7.8 0.0071 Exploitation Less Likely
High CVE-2021-40477 Windows Event Tracing Elevation of Privilege 7.8 0.0058 Exploitation Less Likely
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