Patch tracker / CVE reference / CVE-2025-55339
CVE-2025-55339
CVE-2025-55339 is a high severity Microsoft vulnerability with a CVSS score of 7.8. Microsoft has shipped the fix: deploy one of the 4 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 6.0%. CVSS 7.8 (High).
This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability.
NDIS, the network driver interface layer underneath every network adapter, is where this Critical (CVSS 9.9) elevation of privilege flaw lives, affecting Windows 11 25H2 and Windows Server 2022. A bug this deep in the networking stack is reachable on every machine with a NIC, which is to say all of them. No exploitation is confirmed and EPSS reads 6 percent.
Do this: Put Windows Server 2022 network-facing hosts at the front of the queue for this update.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2025-55339
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Official patch(es) for CVE-2025-55339
Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5066780, KB5066782, KB5066793, KB5066835 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-2025-55339. 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.