What is CVE-2025-66221?

CVE-2025-66221 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. Werkzeug safe_join() allows Windows special device names

Which CVE IDs does CVE-2025-66221 cover?

CVE-2025-66221 covers the following CVE IDs: CVE-2025-66221. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

CVE-2025-66221Medium

Werkzeug safe_join() allows Windows special device names

Vendor

Microsoft Security Response Center (MSRC)

Published

May 31, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2025-66221 →