Patch tracker / CVE reference / CVE-2025-27471
CVE-2025-27471
CVE-2025-27471 is a medium severity Microsoft vulnerability with a CVSS score of 5.9. Its EPSS score puts the probability of exploitation in the next 30 days at 14%. Microsoft has shipped the fix: deploy one of the 14 updates 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 14%. CVSS 5.9 (Medium).
This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability.
CVE-2025-27471 is a denial of service flaw in the Microsoft Streaming Service on Windows 10 Version 1809 and Windows Server 2019, rated High severity at CVSS 8.8. The 8.8 score is unusually high for a denial of service issue, which suggests an exploit path beyond a simple crash, and the 13 percent EPSS puts it above typical background noise even though it is not in CISA KEV and has no known ransomware use.
Do this: Deploy the Microsoft patch for the Streaming Service to all Windows 10 1809 and Windows Server 2019 hosts, prioritizing the 1809 builds still pinned to that older release.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2025-27471
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Official patch(es) for CVE-2025-27471
Elevated priority: high severity or a meaningful exploitation probability, sooner if an affected product is internet-facing. In Intune or Defender, confirm whether the fixing updates KB5055518, KB5055519, KB5055521, KB5055523, KB5055526, KB5055527, KB5055528, KB5055547, KB5055557, KB5055561, KB5055570, KB5055581, KB5055596, KB5055609 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-2025-27471. 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 updates
- Authoritative references
Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.