Microsoft · Security update · October 12, 2021

KB5006669: October 2021 cumulative update for Windows 10 1607

KB5006669, released October 12, 2021, fixes 34 CVEs across 4 products. One of them is being exploited (CVE-2021-40449); 1 on CISA KEV. Patch Radar priority: Patch now.

Patch now1 on CISA KEVKnown ransomware use4 publicly disclosed
CVEs closed
34
None rated Critical
Exploited
1
CVE-2021-40449
Exploitation more likely
5
Vendor assessment
Highest EPSS
0.8194
99th percentile

Priority of the 34 CVEs

Patch now 1 Urgent 5 High 17 Routine 11

Applies to

ProductBuild after install
Windows 10 Version 1607 for 32-bit Systems14393.4704
Windows 10 Version 1607 for x64-based Systems14393.4704
Windows Server 201614393.4704
Windows Server 2016 (Server Core installation)14393.4704

CVEs this fix closes

PriorityCVEComponentImpactCVSSEPSSExploitation
Patch now CVE-2021-40449 Windows Win32K Elevation of Privilege 7.8 0.8194 KEVRansomwareExploited
Urgent CVE-2021-36970 Windows Print Spooler Components Spoofing 8.8 0.0306 More 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-2021-40469 Role: DNS Server Remote Code Execution 7.2 0.0758 DisclosedExploitation Less 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-2021-40465 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-2021-41331 Microsoft Windows Codecs Library Remote Code Execution 7.8 0.0203 Exploitation Less Likely
High CVE-2021-41340 Microsoft Graphics Component Remote Code Execution 7.8 0.0203 Exploitation Less Likely
High CVE-2021-41335 Windows Kernel Elevation of Privilege 7.8 0.0137 DisclosedExploitation 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
Routine CVE-2021-41338 Windows AppContainer Security Feature Bypass 5.5 0.0330 DisclosedExploitation Less Likely
Routine CVE-2021-41332 Windows Print Spooler Components Information Disclosure 6.5 0.0272 Exploitation Less Likely
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