Microsoft · Security update · April 13, 2021

KB5001383: April 2021 security update

KB5001383, released April 13, 2021, fixes 54 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: Urgent.

Urgent2 publicly disclosed

CVEs closed

14 rated Critical

Exploited

None reported

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.6410

99th percentile

Priority of the 54 CVEs

Patch now 0
                                Urgent 16
                                High 26
                                Routine 12

Applies to

Product
Windows Server 2012
Windows Server 2012 (Server Core installation)

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
Urgent	CVE-2021-28325	Windows SMB Server	Information Disclosure	6.5	0.6410	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-2021-28445	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
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
High	CVE-2021-28341	Windows Remote Procedure Call Runtime	Remote Code Execution	8.8	0.0247	Exploitation Less Likely
High	CVE-2021-28342	Windows Remote Procedure Call Runtime	Remote Code Execution	8.8	0.0247	Exploitation Less Likely

Released the same day

KB2553491
Microsoft Office 2010 Service Pack 2 (32-bit editions), Microsoft Office 2010 Service Pack 2 (64-bit editions)
KB2589361
Microsoft Office 2010 Service Pack 2 (32-bit editions), Microsoft Office 2010 Service Pack 2 (64-bit editions)
KB3017810
Microsoft Excel 2010 Service Pack 2 (32-bit editions), Microsoft Excel 2010 Service Pack 2 (64-bit editions)
KB3178639
Microsoft Office 2013 Service Pack 1 (32-bit editions), Microsoft Office 2013 Service Pack 1 (64-bit editions)
KB3178643
Microsoft Office 2013 Service Pack 1 (32-bit editions), Microsoft Office 2013 Service Pack 1 (64-bit editions)
KB4493170
Microsoft SharePoint Enterprise Server 2013 Service Pack 1
KB4493185
Microsoft Outlook 2010 Service Pack 2 (32-bit editions), Microsoft Outlook 2010 Service Pack 2 (64-bit editions)
KB4493198
Microsoft Word 2016 (32-bit edition), Microsoft Word 2016 (64-bit edition)
KB4493201
Microsoft SharePoint Enterprise Server 2013 Service Pack 1
KB4493208
Microsoft Word 2013 RT Service Pack 1, Microsoft Word 2013 Service Pack 1 (32-bit editions), Microsoft Word 2013 Service Pack 1 (64-bit editions)
KB4493215
Microsoft Office 2010 Service Pack 2 (32-bit editions), Microsoft Office 2010 Service Pack 2 (64-bit editions)
KB4493218
Microsoft Word 2010 Service Pack 2 (32-bit editions), Microsoft Word 2010 Service Pack 2 (64-bit editions)

Vendor advisory

https://support.microsoft.com/help/5001383

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