Microsoft · Security update · April 13, 2021

KB5001337: April 2021 cumulative update for Windows 10 1909

KB5001337, released April 13, 2021, fixes 78 CVEs across 4 products. One of them is being exploited (CVE-2021-28310); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.

Patch now1 on CISA KEV2 publicly disclosedUnsupported product
CVEs closed
78
14 rated Critical
Exploited
1
CVE-2021-28310
Exploitation more likely
4
Vendor assessment
Highest EPSS
0.6410
99th percentile

Priority of the 78 CVEs

Patch now 1 Urgent 18 High 37 Routine 22

Applies to

ProductBuild after install
Windows 10 Version 1909 for 32-bit Systems18363.1500
Windows 10 Version 1909 for ARM64-based Systems18363.1500
Windows 10 Version 1909 for x64-based Systems18363.1500
Windows Server, version 1909 (Server Core installation)18363.1500

CVEs this fix closes

PriorityCVEComponentImpactCVSSEPSSExploitation
Patch now CVE-2021-28310 Windows Win32K Elevation of Privilege 7.8 0.0840 KEVExploited
Urgent CVE-2021-28325 Windows SMB Server Information Disclosure 6.5 0.6410 More likely
Urgent CVE-2021-28319 Windows TCP/IP Denial of Service 7.5 0.0999 More likely
Urgent CVE-2021-28442 Windows TCP/IP Information Disclosure 6.5 0.0693 More likely
Urgent CVE-2021-27095 Windows Media Player Remote Code Execution 7.8 0.0435 Exploitation Less Likely
Urgent CVE-2021-28333 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0254 Exploitation Less Likely
Urgent CVE-2021-28329 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0247 Exploitation Less Likely
Urgent CVE-2021-28330 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0247 Exploitation Less Likely
Urgent CVE-2021-28331 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0247 Exploitation Less Likely
Urgent CVE-2021-28332 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0247 Exploitation Less Likely
Urgent CVE-2021-28334 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0247 Exploitation Less Likely
Urgent CVE-2021-28335 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0247 Exploitation Less Likely
Urgent CVE-2021-28336 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0247 Exploitation Less Likely
Urgent CVE-2021-28337 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0247 Exploitation Less Likely
Urgent CVE-2021-28338 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0247 Exploitation Less Likely
Urgent CVE-2021-28339 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0247 Exploitation Less Likely
Urgent CVE-2021-28343 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0247 Exploitation Less Likely
Urgent CVE-2021-28315 Windows Media Player Remote Code Execution 7.8 0.0160 Exploitation Less Likely
Urgent CVE-2021-27072 Windows Win32K Elevation of Privilege 7.0 0.0065 More likely
High CVE-2020-17049 Microsoft Windows Security Feature Bypass 7.2 0.1379 Exploitation Less Likely
High CVE-2021-28439 Windows TCP/IP Denial of Service 7.5 0.0653 Exploitation Less Likely
High CVE-2021-26416 Role: Windows Hyper-V Denial of Service 7.7 0.0420 Exploitation Less Likely
High CVE-2021-26415 Windows Installer Elevation of Privilege 7.8 0.0357 Exploitation Less Likely
High CVE-2021-28445 Windows Network File System Remote Code Execution 8.1 0.0290 Exploitation Less Likely
High CVE-2021-28327 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0254 Exploitation Less Likely
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