Microsoft · Security update · October 14, 2025
KB5066837: October 2025 cumulative update for Windows 10 1809/Server 2019
KB5066837, released October 14, 2025, fixes 68 CVEs across 2 products. 3 of them are being exploited (CVE-2025-24990); 3 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.
Patch now3 on CISA KEV1 publicly disclosedUnsupported product
CVEs closed
68
1 rated Critical
Exploited
3
CVE-2025-24990
Exploitation more likely
2
Microsoft's assessment
Highest EPSS
0.0651
93rd percentile
Priority of the 68 CVEs
Patch now 3
Urgent 3
High 38
Routine 24
Applies to
| Product | Build after install |
|---|---|
| Windows 10 for 32-bit Systems | 10240.21161 |
| Windows 10 for x64-based Systems | 10240.21161 |
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Patch now | CVE-2025-24990 | Agere Windows Modem Driver | Elevation of Privilege | 7.8 | 0.0651 | KEVExploited |
| Patch now | CVE-2025-47827 | Windows Secure Boot | Security Feature Bypass | 4.6 | 0.0515 | KEVExploited |
| Patch now | CVE-2025-59230 | Windows Remote Access Connection Manager | Elevation of Privilege | 7.8 | 0.0272 | KEVExploited |
| Urgent | CVE-2016-9535 | Microsoft Graphics Component | Remote Code Execution | 4.0 | 0.0473 | Exploitation Unlikely |
| Urgent | CVE-2025-55692 | Windows Error Reporting | Elevation of Privilege | 7.8 | 0.0363 | More likely |
| Urgent | CVE-2025-24052 | Agere Windows Modem Driver | Elevation of Privilege | 7.8 | 0.0254 | DisclosedMore likely |
| High | CVE-2025-59295 | Internet Explorer | Remote Code Execution | 8.8 | 0.0190 | Exploitation Less Likely |
| High | CVE-2025-54957 | Microsoft Windows Codecs Library | Remote Code Execution | 7.0 | 0.0160 | Exploitation Less Likely |
| High | CVE-2025-59254 | Windows DWM Core Library | Elevation of Privilege | 7.8 | 0.0114 | Exploitation Unlikely |
| High | CVE-2025-58726 | Windows SMB Server | Elevation of Privilege | 7.5 | 0.0104 | Exploitation Less Likely |
| High | CVE-2025-59200 | Data Sharing Service Client | Spoofing | 7.7 | 0.0081 | Exploitation Less Likely |
| High | CVE-2025-59282 | Inbox COM Objects | Remote Code Execution | 7.0 | 0.0061 | Exploitation Unlikely |
| High | CVE-2025-58718 | Remote Desktop Client | Remote Code Execution | 8.8 | 0.0060 | Exploitation Less Likely |
| High | CVE-2025-59208 | Windows MapUrlToZone | Information Disclosure | 7.1 | 0.0050 | Exploitation Less Likely |
| High | CVE-2025-25004 | Microsoft PowerShell | Elevation of Privilege | 7.3 | 0.0049 | Exploitation Less Likely |
| High | CVE-2025-58732 | Inbox COM Objects | Remote Code Execution | 7.0 | 0.0047 | Exploitation Unlikely |
| High | CVE-2025-58735 | Inbox COM Objects | Remote Code Execution | 7.0 | 0.0047 | Exploitation Unlikely |
| High | CVE-2025-59201 | Network Connection Status Indicator (NCSI) | Elevation of Privilege | 7.8 | 0.0046 | Exploitation Less Likely |
| High | CVE-2025-64679 | Windows DWM Core Library | Elevation of Privilege | 7.8 | 0.0045 | Exploitation Less Likely |
| High | CVE-2025-50152 | Windows Kernel | Elevation of Privilege | 7.8 | 0.0043 | Exploitation Less Likely |
| High | CVE-2025-55701 | Microsoft Windows | Elevation of Privilege | 7.8 | 0.0041 | Exploitation Less Likely |
| High | CVE-2025-59242 | Windows Ancillary Function Driver for WinSock | Elevation of Privilege | 7.8 | 0.0041 | Exploitation Less Likely |
| High | CVE-2025-58715 | Microsoft Windows Speech | Elevation of Privilege | 8.8 | 0.0040 | Exploitation Unlikely |
| High | CVE-2025-58716 | Microsoft Windows Speech | Elevation of Privilege | 8.8 | 0.0040 | Exploitation Unlikely |
| High | CVE-2025-59277 | Windows Authentication Methods | Elevation of Privilege | 7.8 | 0.0039 | Exploitation Less Likely |
Showing 1 to 25 of 68
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