Microsoft · Security update · July 13, 2021

KB5004245: July 2021 cumulative update for Windows 10 1909

KB5004245, released July 13, 2021, fixes 66 CVEs across 4 products. 3 of them are being exploited (CVE-2021-34448); 3 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.

Patch now3 on CISA KEV2 publicly disclosedUnsupported product
CVEs closed
66
4 rated Critical
Exploited
3
CVE-2021-34448
Exploitation more likely
1
Vendor assessment
Highest EPSS
0.4006
98th percentile

Priority of the 66 CVEs

Patch now 3 Urgent 4 High 39 Routine 20

Applies to

ProductBuild after install
Windows 10 Version 1909 for 32-bit Systems18363.1679
Windows 10 Version 1909 for ARM64-based Systems18363.1679
Windows 10 Version 1909 for x64-based Systems18363.1679
Windows Server, version 1909 (Server Core installation)18363.1679

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-2021-34449 Windows Win32K Elevation of Privilege 7.0 0.0271 More 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-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-2021-34489 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-2021-33749 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
High CVE-2021-33781 Windows Active Directory Security Feature Bypass 8.1 0.0241 DisclosedExploitation Less Likely
High CVE-2021-33756 Role: DNS Server Remote Code Execution 8.8 0.0241 Exploitation Less Likely
High CVE-2021-34521 Microsoft Windows Codecs Library Remote Code Execution 7.8 0.0238 Exploitation Less Likely
High CVE-2021-34508 Windows Kernel Remote Code Execution 8.8 0.0225 Exploitation Less Likely
High CVE-2021-34438 Microsoft Graphics Component Remote Code Execution 7.8 0.0222 Exploitation Less Likely
High CVE-2021-34441 Microsoft Windows Media Foundation Remote Code Execution 7.8 0.0222 Exploitation Less Likely
High CVE-2021-34446 Windows HTML Platform Security Feature Bypass 8.0 0.0205 Exploitation Less Likely
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