Microsoft · Security update · February 9, 2021

KB4601354: February 2021 cumulative update for Windows 10 1803

KB4601354, released February 9, 2021, fixes 24 CVEs across 6 products. One of them is being exploited (CVE-2021-1732); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.

Patch now1 on CISA KEVKnown ransomware use3 publicly disclosedUnsupported product
CVEs closed
24
6 rated Critical
Exploited
1
CVE-2021-1732
Exploitation more likely
5
Vendor assessment
Highest EPSS
0.7838
99th percentile

Priority of the 24 CVEs

Patch now 1 Urgent 9 High 7 Routine 7

Applies to

ProductBuild after install
Microsoft .NET Framework 4.7.2 on Windows 10 Version 1803 for 32-bit Systems17134.2026
Microsoft .NET Framework 4.7.2 on Windows 10 Version 1803 for ARM64-based Systems17134.2026
Microsoft .NET Framework 4.7.2 on Windows 10 Version 1803 for x64-based Systems17134.2026
Windows 10 Version 1803 for 32-bit Systems17134.2026
Windows 10 Version 1803 for ARM64-based Systems17134.2026
Windows 10 Version 1803 for x64-based Systems17134.2026

CVEs this fix closes

PriorityCVEComponentImpactCVSSEPSSExploitation
Patch now CVE-2021-1732 Windows Kernel Elevation of Privilege 7.8 0.7838 KEVRansomwareExploited
Urgent CVE-2021-24086 Windows TCP/IP Denial of Service 7.5 0.5896 More likely
Urgent CVE-2021-24093 Microsoft Graphics Component Remote Code Execution 8.8 0.4590 Exploitation Less Likely
Urgent CVE-2021-24074 Windows TCP/IP Remote Code Execution 9.8 0.2616 More likely
Urgent CVE-2021-24094 Windows TCP/IP Remote Code Execution 9.8 0.2214 More likely
Urgent CVE-2021-24077 Role: Windows Fax Service Remote Code Execution 9.8 0.0287 Exploitation Less Likely
Urgent CVE-2021-1722 Role: Windows Fax Service Remote Code Execution 8.1 0.0244 Exploitation Less Likely
Urgent CVE-2021-24088 Windows Print Spooler Components Remote Code Execution 8.8 0.0243 Exploitation Less Likely
Urgent CVE-2021-1727 Windows Installer Elevation of Privilege 7.8 0.0076 DisclosedMore likely
Urgent CVE-2021-1698 Windows Kernel Elevation of Privilege 7.8 0.0066 More likely
High CVE-2021-1692 Windows Hyper-V Denial of Service 7.7 0.0424 Exploitation Less Likely
High CVE-2021-24111 .NET Framework Denial of Service 7.5 0.0384 Exploitation Less Likely
High CVE-2021-1734 Windows Remote Procedure Call Information Disclosure 7.5 0.0381 Exploitation Less Likely
High CVE-2021-24083 Windows Address Book Remote Code Execution 7.8 0.0287 Exploitation Less Likely
High CVE-2021-24103 Windows Event Tracing Elevation of Privilege 7.8 0.0063 Exploitation Less Likely
High CVE-2021-25195 Windows PKU2U Elevation of Privilege 7.8 0.0063 Exploitation Less Likely
High CVE-2021-24102 Windows Event Tracing Elevation of Privilege 7.8 0.0055 Exploitation Less Likely
Routine CVE-2021-24080 Windows Trust Verification API Denial of Service 6.5 0.0305 Exploitation Less Likely
Routine CVE-2021-24082 Windows PowerShell Security Feature Bypass 4.3 0.0263 Exploitation Less Likely
Routine CVE-2021-24098 Windows Console Driver Denial of Service 5.5 0.0152 DisclosedExploitation Less Likely
Routine CVE-2021-24076 Role: Windows Hyper-V Information Disclosure 5.5 0.0095 Exploitation Less Likely
Routine CVE-2021-24079 Windows Backup Engine Information Disclosure 5.5 0.0095 Exploitation Less Likely
Routine CVE-2021-24106 Windows DirectX Information Disclosure 5.5 0.0095 DisclosedExploitation Less Likely
Routine CVE-2021-1731 Windows PFX Encryption Security Feature Bypass 5.5 0.0088 Exploitation Less Likely
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