Patch tracker / CVE reference / CVE-2025-59206
CVE-2025-59206
CVE-2025-59206 is a high severity Microsoft vulnerability with a CVSS score of 7.4. Microsoft has shipped the fix: deploy the update below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.
Risk summary
Not in the CISA KEV catalog. EPSS exploit probability 6.0%. CVSS 7.4 (High).
This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability.
This ReFS Deduplication Service elevation-of-privilege flaw rates Critical 9.9 with a 6 percent EPSS score on Windows 11 25H2 and Server 2025 Server Core. The dedup service runs with high privilege on storage volumes, so a bug there is a valuable local-escalation target on file servers. Severity is at the top of the scale even as modeled exploitation stays low. It is not in CISA KEV.
Do this: Update Server 2025 Core and Windows 11 25H2 hosts running ReFS deduplication and restrict who can log on locally to those storage systems.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2025-59206
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Official patch(es) for CVE-2025-59206
Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing update KB5066835 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.
Apply the Microsoft security update below to fix CVE-2025-59206. 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.
Scope and sources
- Affected products
- Fixed by the same update
- Authoritative references
Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.