Microsoft CVE-2026-32068

The Simple Service Discovery Protocol (SSDP) is a core Windows networking component used for UPnP device discovery and communication. This vulnerability (CWE-362) stems from a time-of-check-to-time-of-use (TOCTOU) race condition where the SSDP Service improperly synchronizes access to shared resources during concurrent operations. The flaw allows a local attacker with low privileges to manipulate the timing of resource access, creating a window where they can inject malicious operations between validation checks and resource use. The affected service typically runs with elevated SYSTEM privileges, making successful exploitation a direct path to complete system control. The vulnerability spans an exceptionally broad Windows footprint including legacy systems (Server 2012, Windows 10 1607) through current releases (Windows 11 26H1, Server 2025), indicating a longstanding architectural issue in the SSDP implementation. The AC:H (high complexity) rating suggests successful exploitation requires precise timing and potentially multiple attempts, though once weaponized, such techniques are typically reliable.