Microsoft · Out-of-band update · July 7, 2021

KB5004948: July 2021 cumulative update for Windows 10 1607

KB5004948, released July 7, 2021, fixes 1 CVE across 4 products. One of them is being exploited (CVE-2021-34527); 1 on CISA KEV. Patch Radar priority: Patch now.

Patch now1 on CISA KEVKnown ransomware use1 publicly disclosed

CVEs closed

1 rated Critical

Exploited

CVE-2021-34527

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.9979

99th percentile

Applies to

Product	Build after install
Windows 10 Version 1607 for 32-bit Systems	14393.4470
Windows 10 Version 1607 for x64-based Systems	14393.4470
Windows Server 2016	14393.4470
Windows Server 2016 (Server Core installation)	14393.4470

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
Patch now	CVE-2021-34527	Windows Print Spooler Components	Remote Code Execution	8.8	0.9979	KEVRansomwareDisclosedExploited

Also fixes CVE-2021-34527

KB5019959
Windows 10 Version 20H2 for 32-bit Systems, Windows 10 Version 20H2 for ARM64-based Systems, Windows 10 Version 21H1 for 32-bit Systems and 8 more
KB5018427
Windows 11 Version 22H2 for ARM64-based Systems, Windows 11 Version 22H2 for x64-based Systems
KB5005575
Windows Server 2022, Windows Server 2022 (Server Core installation)
KB5008212
Windows 10 Version 2004 for 32-bit Systems, Windows 10 Version 2004 for ARM64-based Systems, Windows 10 Version 2004 for x64-based Systems and 10 more
KB5007215
Microsoft Edge (Chromium-based) in IE Mode on Windows 11 version 21H2 for ARM64-based Systems, Microsoft Edge (Chromium-based) in IE Mode on Windows 11 version 21H2 for x64-based Systems, Windows 11 version 21H2 for ARM64-based Systems and 1 more
KB5004945
Windows 10 Version 20H2 for 32-bit Systems, Windows 10 Version 20H2 for ARM64-based Systems, Windows 10 Version 20H2 for x64-based Systems and 1 more
KB5004947
Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for ARM64-based Systems, Windows 10 Version 1809 for x64-based Systems and 2 more
KB5004950
Windows 10 for 32-bit Systems, Windows 10 for x64-based Systems

Vendor advisory

https://support.microsoft.com/help/5004948

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