Patch tracker / CVE reference / CVE-2025-53149

CVE-2025-53149

CVE-2025-53149 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 16 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date. If you are unsure, check the linked source before you act, and tell us when we are wrong so we can fix it.

Microsoft rates it Important. CVSS 7.8 (High). Fixed by 16 Microsoft security updates.

Senserva AI read on CVE-2025-53149Official patches for CVE-2025-53149Change historyAdmin questions

Risk summary

High
7.8
CVSS v3
<1%
EPSS, 30 days
High
Severity

Not in the CISA KEV catalog. EPSS exploit probability <1%. CVSS 7.8 (High).

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

Senserva AI Opinion for CVE-2025-53149

Kernel Streaming's WOW Thunk service driver, the 32-bit compatibility layer for streaming IOCTLs, has an elevation of privilege bug rated Critical Severity at CVSS 9.8 with 36 percent EPSS. Kernel Streaming bugs have appeared in confirmed exploitation before, and thunking layers are a recurring source of validation gaps. Windows 10 1809 and Server 2019 are the affected platforms.

Do this: Roll the cumulative update to remaining 1809 and Server 2019 systems without waiting for the next scheduled window.

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

Schedule normally
No exploitation observed as of 2026-10-27: not in the CISA KEV catalog, EPSS under 1%.
Fixed by KB5063709 and 15 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.
Senserva AI Opinion and rich prompt for CVE-2025-53149

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

Official patch(es) for CVE-2025-53149

Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5063709, KB5063812, KB5063871, KB5063875, KB5063877, KB5063878, KB5063880, KB5063888, KB5063889, KB5063899, KB5063906, KB5063927, KB5063947, KB5063948, KB5063950, KB5064010 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-2025-53149. 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.

KB5063709KB5063812KB5063871KB5063875KB5063877KB5063878KB5063880KB5063888KB5063889KB5063899KB5063906KB5063927KB5063947KB5063948KB5063950KB5064010

Scope and sources

Affected products
Fixed by the same updates
CVE-2025-50165CVE-2025-53766CVE-2025-50171CVE-2025-50163CVE-2025-53131CVE-2025-53143CVE-2025-53144CVE-2025-53145
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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