KB5065509

Microsoft security update released 2025-09-09. Fixes 34 CVEs.

High

Download KB5065509

Get the official update for KB5065509. The download and file size for each supported product are on the Microsoft Update Catalog page.

Microsoft Update Catalog: download KB5065509 Microsoft support article

Update summary

Released

2025-09-09

CVEs fixed

Max CVSS

8.8

Severity

High

Exploitation and severity

Fixes 34 CVEs. Most severe CVSS 8.8 (High). EPSS exploit probability up to 19%.

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

What to do

Elevated priority: high severity or a meaningful exploitation probability, sooner if an affected product is internet-facing. Senserva flags whether KB5065509 is missing on your devices.

Affected products

Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022

References

Microsoft support article Microsoft Security Update Guide

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