A chained exploit comprising three zero-day vulnerabilities in Siemens ROX II OT switches allows an attacker to escalate from arbitrary file disclosure to full persistent root-level access. CVE-2025-40948 leverages a root-privileged xz utility to read any file on the filesystem, CVE-2025-40947 exploits unsanitized input in the feature key signature verification to achieve command injection as root, and CVE-2025-40949 enables persistent code execution by injecting commands into the root cron table via the web management task scheduler. Siemens has released firmware V2.17.1 to address all three vulnerabilities.
OT Zero-Day
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Three Steps to the Terminal: A Siemens ROX II Zero-Day Trilogy