Patch tracker / CVE reference / CVE-2025-21171
CVE-2025-21171
CVE-2025-21171 is a high severity Microsoft vulnerability with a CVSS score of 7.5. 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 2.4%. CVSS 7.5 (High).
This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability.
A remote code execution flaw in .NET whose affected list is PowerShell 7.5 across Windows, Linux, and macOS, rated High Severity at CVSS 8.8 with a 2 percent exploit probability. PowerShell runs with meaningful privileges on the systems that manage everything else, so code execution through its runtime is a lever over your automation layer. The three-platform spread means Linux management nodes need the update as much as Windows admin boxes.
Do this: Update PowerShell 7.5 on every platform it is installed, prioritizing CI agents and administrative servers.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2025-21171
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Official patch(es) for CVE-2025-21171
Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing update KB5050526 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-2025-21171. 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.