Microsoft · Security update · July 13, 2021

KB5004244: July 2021 cumulative update for Windows 10 1809

KB5004244, released July 13, 2021, fixes 78 CVEs across 5 products. 3 of them are being exploited (CVE-2021-34448); 3 on CISA KEV. Patch Radar priority: Patch now.

Patch now3 on CISA KEV3 publicly disclosed
CVEs closed
78
7 rated Critical
Exploited
3
CVE-2021-34448
Exploitation more likely
2
Vendor assessment
Highest EPSS
0.4006
98th percentile

Priority of the 78 CVEs

Patch now 3 Urgent 8 High 44 Routine 23

Applies to

ProductBuild after install
Windows 10 Version 1809 for 32-bit Systems17763.2061
Windows 10 Version 1809 for ARM64-based Systems17763.2061
Windows 10 Version 1809 for x64-based Systems17763.2061
Windows Server 201917763.2061
Windows Server 2019 (Server Core installation)17763.2061

CVEs this fix closes

PriorityCVEComponentImpactCVSSEPSSExploitation
Patch now CVE-2021-34448 Microsoft Scripting Engine Remote Code Execution 6.8 0.4006 KEVExploited
Patch now CVE-2021-33771 Windows Kernel Elevation of Privilege 7.8 0.1017 KEVExploited
Patch now CVE-2021-31979 Windows Kernel Elevation of Privilege 7.8 0.0454 KEVExploited
Urgent CVE-2021-34494 Role: DNS Server Remote Code Execution 8.8 0.0405 Exploitation Less Likely
Urgent CVE-2021-33740 Microsoft Windows Codecs Library Remote Code Execution 7.8 0.0276 Exploitation Less Likely
Urgent CVE-2021-34449 Windows Win32K Elevation of Privilege 7.0 0.0271 More likely
Urgent CVE-2021-33780 Role: DNS Server Remote Code Execution 8.8 0.0271 More likely
Urgent CVE-2021-34458 Windows Kernel Remote Code Execution 9.9 0.0263 Exploitation Less Likely
Urgent CVE-2021-34450 Role: Windows Hyper-V Remote Code Execution 8.5 0.0250 Exploitation Less Likely
Urgent CVE-2021-34503 Microsoft Windows Media Foundation Remote Code Execution 7.8 0.0231 Exploitation Less Likely
Urgent CVE-2021-34497 Windows MSHTML Platform Remote Code Execution 6.8 0.0215 Exploitation Less Likely
High CVE-2020-17049 Microsoft Windows Security Feature Bypass 7.2 0.1379 Exploitation Less Likely
High CVE-2021-31183 Windows TCP/IP Denial of Service 7.5 0.0384 Exploitation Less Likely
High CVE-2021-34504 Windows Address Book Remote Code Execution 7.8 0.0347 Exploitation Less Likely
High CVE-2021-33788 Windows Local Security Authority Subsystem Service (LSASS) Denial of Service 7.5 0.0328 Exploitation Less Likely
High CVE-2021-34476 Common Internet File System Denial of Service 7.5 0.0328 Exploitation Less Likely
High CVE-2021-34490 Windows TCP/IP Denial of Service 7.5 0.0328 Exploitation Less Likely
High CVE-2021-33785 Windows AF_UNIX Socket Provider Denial of Service 7.5 0.0325 Exploitation Less Likely
High CVE-2021-34442 Role: DNS Server Remote Code Execution 8.8 0.0317 Exploitation Less Likely
High CVE-2021-34489 Microsoft Graphics Component Remote Code Execution 7.8 0.0247 Exploitation Less Likely
High CVE-2021-34492 Windows PFX Encryption Spoofing 8.1 0.0247 DisclosedExploitation Less Likely
High CVE-2021-33779 Active Directory Federation Services Security Feature Bypass 8.1 0.0244 DisclosedExploitation Less Likely
High CVE-2021-33749 Role: DNS Server Remote Code Execution 8.8 0.0242 Exploitation Less Likely
High CVE-2021-33750 Role: DNS Server Remote Code Execution 8.8 0.0242 Exploitation Less Likely
High CVE-2021-33752 Role: DNS Server Remote Code Execution 8.8 0.0242 Exploitation Less Likely
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