Microsoft · Security update · July 13, 2021

KB5004285: July 2021 security update

KB5004285, released July 13, 2021, fixes 45 CVEs across 4 products. 2 of them are being exploited (CVE-2021-33771); 2 on CISA KEV. Patch Radar priority: Patch now.

Patch now2 on CISA KEV1 publicly disclosed
CVEs closed
45
1 rated Critical
Exploited
2
CVE-2021-33771
Exploitation more likely
1
Vendor assessment
Highest EPSS
0.1379
96th percentile

Priority of the 45 CVEs

Patch now 2 Urgent 2 High 26 Routine 15

Applies to

Product
Windows 8.1 for 32-bit systems
Windows 8.1 for x64-based systems
Windows Server 2012 R2
Windows Server 2012 R2 (Server Core installation)

CVEs this fix closes

PriorityCVEComponentImpactCVSSEPSSExploitation
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-2021-34494 Role: DNS Server Remote Code Execution 8.8 0.0405 Exploitation Less Likely
Urgent CVE-2021-33780 Role: DNS Server Remote Code Execution 8.8 0.0271 More likely
High CVE-2020-17049 Microsoft Windows Security Feature Bypass 7.2 0.1379 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-2021-34442 Role: DNS Server Remote Code Execution 8.8 0.0317 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-2021-33756 Role: DNS Server Remote Code Execution 8.8 0.0241 Exploitation Less Likely
High CVE-2021-34525 Role: DNS Server Remote Code Execution 8.8 0.0225 Exploitation Less Likely
High CVE-2021-34441 Microsoft Windows Media Foundation Remote Code Execution 7.8 0.0222 Exploitation Less Likely
High CVE-2021-33786 Windows Local Security Authority Subsystem Service (LSASS) Security Feature Bypass 8.1 0.0212 Exploitation Less Likely
High CVE-2021-33746 Microsoft Windows DNS Remote Code Execution 8.0 0.0200 Exploitation Less Likely
High CVE-2021-33754 Microsoft Windows DNS Remote Code Execution 8.0 0.0198 Exploitation Less Likely
High CVE-2021-34516 Windows Win32K Elevation of Privilege 7.8 0.0130 Exploitation Less Likely
High CVE-2021-34498 Microsoft Graphics Component Elevation of Privilege 7.8 0.0106 Exploitation Less Likely
High CVE-2021-34514 Windows Kernel Elevation of Privilege 7.8 0.0070 Exploitation Less Likely
High CVE-2021-33773 Windows Remote Access Connection Manager Elevation of Privilege 7.8 0.0064 Exploitation Less Likely
High CVE-2021-33761 Windows Remote Access Connection Manager Elevation of Privilege 7.8 0.0061 Exploitation Less Likely
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