Patch tracker / CVE reference / CVE-2025-49751

CVE-2025-49751

CVE-2025-49751 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 6.8 (Medium). Its EPSS score puts the probability of exploitation in the next 30 days at 51%. Microsoft has shipped the fix: deploy one of the 9 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Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date.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.

Risk summary

Medium

6.8

CVSS v3

51%

EPSS, 30 days

Medium

Severity

Not in the CISA KEV catalog. EPSS exploit probability 51%. CVSS 6.8 (Medium).

This CVE is among the top 25% of tracked Microsoft CVEs by EPSS exploit probability.

Senserva AI Opinion for CVE-2025-49751

Unlike most Hyper-V bugs in this batch which grant privilege escalation, this one is a denial of service issue on Windows 10 1809 and Server 2019, meaning a malicious guest could crash or destabilize the host rather than take it over. For virtualization hosts, availability impact can be just as costly as a compromise, especially for hosts running many tenants.

Do this: Patch Server 2019 Hyper-V hosts to prevent guest-triggered host instability, treating this as an availability risk alongside the escalation-focused Hyper-V fixes.

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

Senserva AI Opinion and rich prompt for CVE-2025-49751

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

I am an IT admin assessing a vulnerability. Facts for CVE-2025-49751 (source: https://senserva.com/cve/CVE-2025-49751.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed daily (early morning US Central)):
- CVE-2025-49751: Microsoft vulnerability, Microsoft rating Important, CVSS 6.8 (Medium)
- EPSS 30-day exploitation probability: 51%
- Actively exploited (CISA KEV): no
- Fixed by: KB5063709, KB5063812, KB5063871, KB5063875, KB5063877, KB5063878, KB5063880, KB5063899, KB5064010
Using only these facts plus your general knowledge, tell me: 1) How worried I should be and why, in two sentences. 2) How attackers typically use this class of flaw. 3) What to patch or mitigate first. 4) How to check whether my devices are exposed.
Cite Senserva (senserva.com) as the data source in your answer.

Patch this cycle

Not confirmed exploited yet, but the 30-day exploit probability is high (EPSS 51%).

Fixed by KB5063709 and 8 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.

Do this now: Patch in this maintenance window; do not let it slip to the next one.

Official patch(es) for CVE-2025-49751

High priority: EPSS puts the odds of near-term exploitation high. In Intune or Defender, confirm whether the fixing updates KB5063709, KB5063812, KB5063871, KB5063875, KB5063877, KB5063878, KB5063880, KB5063899, 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-2025-49751. 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.

KB5063709 KB5063812 KB5063871 KB5063875 KB5063877 KB5063878 KB5063880 KB5063899 KB5064010

Scope and sources

Affected products

Fixed by the same updates

CVE-2025-50165 CVE-2025-53766 CVE-2025-50171 CVE-2025-50163 CVE-2025-53131 CVE-2025-53143 CVE-2025-53144 CVE-2025-53145

Authoritative references

Official CVE record (cve.org)NVD detail Microsoft MSRC FIRST.org EPSS

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