Patch tracker / CVE reference / CVE-2025-55328

CVE-2025-55328

CVE-2025-55328 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 7.8 (High). Microsoft has shipped the fix: deploy one of the 8 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

High
7.8
CVSS v3
6.4%
EPSS, 30 days
High
Severity

Not in the CISA KEV catalog. EPSS exploit probability 6.4%. CVSS 7.8 (High).

This CVE is among the top half of tracked Microsoft CVEs by EPSS exploit probability.

Senserva AI Opinion for CVE-2025-55328

Hyper-V is the affected component, which changes the stakes: a Critical (CVSS 9.9) elevation of privilege touching the hypervisor layer on Windows 11 25H2 and Windows 10 1809 x64 threatens the isolation that virtualization-based security features depend on. Hosts running VMs or VBS features carry the practical risk. EPSS estimates 6 percent exploitation probability.

Do this: Patch virtualization hosts and Windows 11 machines using VBS or Credential Guard before general endpoints.

AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2025-55328

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Schedule normally
No exploitation observed as of 2026-10-14: not in the CISA KEV catalog, EPSS 6%.
Fixed by KB5066586 and 7 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.
Do this now: Deploy with your normal update cycle. This page refreshes daily; the verdict changes the day the data does.

Official patch(es) for CVE-2025-55328

Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5066586, KB5066780, KB5066782, KB5066791, KB5066793, KB5066835, KB5066836, KB5066837 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.

Apply the Microsoft security updates below to fix CVE-2025-55328. Each KB page carries the Microsoft Update Catalog download, Microsoft's known issues for the update, a copy-paste PowerShell check for whether it is installed, and the Senserva AI read.

KB5066586KB5066780KB5066782KB5066791KB5066793KB5066835KB5066836KB5066837

Scope and sources

Affected products
Fixed by the same updates
CVE-2025-24990CVE-2025-59230CVE-2025-47827CVE-2025-49708CVE-2025-58715CVE-2025-58716CVE-2025-58718CVE-2025-59295
Authoritative references
Official CVE record (cve.org)NVD detailMicrosoft MSRCFIRST.org EPSS

Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
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