KB5066780

Microsoft security update released 2025-12-09. Fixes 115 CVEs.

CriticalCISA KEV

Download KB5066780

Get the official update for KB5066780. The download and file size for each supported product are on the Microsoft Update Catalog page.

Microsoft Update Catalog: download KB5066780 Microsoft support article

Update summary

Released

2025-12-09

CVEs fixed

115

Max CVSS

9.9

Severity

Critical

Exploitation and severity

Fixes 115 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 9.9 (Critical). EPSS exploit probability up to 5.8%.

Among the top half of tracked Microsoft updates by EPSS exploit probability.

What to do

Treat as urgent: it is being exploited in the wild (CISA KEV), so patch ahead of items that are not. Senserva flags whether KB5066780 is missing on your devices.

CVEs fixed by this update

CVE-2016-9535 CVE-2024-30098 CVE-2025-24052 CVE-2025-24990 CVE-2025-25004 CVE-2025-2884 CVE-2025-47827 CVE-2025-47979 CVE-2025-48004 CVE-2025-48813 CVE-2025-49708 CVE-2025-50152 CVE-2025-50175 CVE-2025-53150 CVE-2025-54957 CVE-2025-55325 CVE-2025-55326 CVE-2025-55328 CVE-2025-55330 CVE-2025-55331 CVE-2025-55332 CVE-2025-55333 CVE-2025-55335 CVE-2025-55336 CVE-2025-55338 CVE-2025-55339 CVE-2025-55340 CVE-2025-55678 CVE-2025-55679 CVE-2025-55680 CVE-2025-55681 CVE-2025-55683 CVE-2025-55685 CVE-2025-55686 CVE-2025-55687 CVE-2025-55689 CVE-2025-55692 CVE-2025-55694 CVE-2025-55695 CVE-2025-55696 CVE-2025-55697 CVE-2025-55699 CVE-2025-55700 CVE-2025-55701 CVE-2025-58714 CVE-2025-58715 CVE-2025-58716 CVE-2025-58717 CVE-2025-58718 CVE-2025-58719 CVE-2025-58720 CVE-2025-58722 CVE-2025-58725 CVE-2025-58726 CVE-2025-58727 CVE-2025-58728 CVE-2025-58729 CVE-2025-58730 CVE-2025-58731 CVE-2025-58732 CVE-2025-58733 CVE-2025-58734 CVE-2025-58735 CVE-2025-58736 CVE-2025-58737 CVE-2025-58738 CVE-2025-58739 CVE-2025-59184 CVE-2025-59185 CVE-2025-59186 CVE-2025-59187 CVE-2025-59188 CVE-2025-59190 CVE-2025-59191 CVE-2025-59192 CVE-2025-59193 CVE-2025-59194 CVE-2025-59195 CVE-2025-59196 CVE-2025-59197 CVE-2025-59198 CVE-2025-59199 CVE-2025-59200 CVE-2025-59201 CVE-2025-59202 CVE-2025-59203 CVE-2025-59204 CVE-2025-59205 CVE-2025-59207 CVE-2025-59208 CVE-2025-59209 CVE-2025-59211 CVE-2025-59214 CVE-2025-59230 CVE-2025-59242 CVE-2025-59244 CVE-2025-59253 CVE-2025-59254 CVE-2025-59255 CVE-2025-59257 CVE-2025-59258 CVE-2025-59259 CVE-2025-59260 CVE-2025-59261 CVE-2025-59275 CVE-2025-59277 CVE-2025-59278 CVE-2025-59280 CVE-2025-59282 CVE-2025-59294 CVE-2025-59295 CVE-2025-62208 CVE-2025-62209 CVE-2025-64679 CVE-2025-64680

Affected products

Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows Server 2019

References

Microsoft support article Microsoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.