Microsoft · Security update · April 13, 2021

KB5001339: April 2021 cumulative update for Windows 10 1803

KB5001339, released April 13, 2021, fixes 70 CVEs across 3 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 KEV1 publicly disclosedUnsupported product
CVEs closed
70
14 rated Critical
Exploited
1
CVE-2021-28310
Exploitation more likely
4
Vendor assessment
Highest EPSS
0.6410
99th percentile

Priority of the 70 CVEs

Patch now 1 Urgent 18 High 32 Routine 19

Applies to

ProductBuild after install
Windows 10 Version 1803 for 32-bit Systems17134.2145
Windows 10 Version 1803 for ARM64-based Systems17134.2145
Windows 10 Version 1803 for x64-based Systems17134.2145

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-2021-28439 Windows TCP/IP Denial of Service 7.5 0.0653 Exploitation Less Likely
High CVE-2021-26415 Windows Installer Elevation of Privilege 7.8 0.0357 Exploitation Less Likely
High CVE-2021-28327 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0254 Exploitation Less Likely
High CVE-2021-28340 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0254 Exploitation Less Likely
High CVE-2021-28344 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0254 Exploitation Less Likely
High CVE-2021-28356 Windows Remote Procedure Call Runtime Remote Code Execution 8.8 0.0254 Exploitation Less Likely
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