A stack-based buffer overflow in the CLI's TFTP file‑transfer command handling allows a low-privileged attacker with Telnet/SSH access to trigger memory corruption by supplying unexpected or oversized filename input. Exploitation results in the corruption of the internal buffer, causing the CLI and web dashboard to become unavailable and leading to a denial of service.

A stack-based buffer overflow in the CLI's TFTP file‑transfer command handling allows a low-privileged attacker with Telnet/SSH access to trigger memory corruption by supplying unexpected or oversized filename input. Exploitation results in the corruption of the internal buffer, causing the CLI and web dashboard to become unavailable and leading to a denial of service.

Multiple vulnerabilities have been identified in the FL SWITCH 2xxx, FL SWITCH TSN 23xx and FL SWITCH 59xx firmware prior to version 3.53. One of these (CVE-2026-22317) enables an attacker to execute system commands as root user on the device. Five other vulnerabilities (CVE-2026-22316, CVE-2026-22318, CVE-2026-22319, CVE-2026-22320 and CVE-2026-22321) are related to Denial of Service (DoS) attacks, which partly limit the device's functionality. Another vulnerability (CVE-2026-22322) relates to reflected cross-site scripting in the web-based management of the device. And one vulnerability (CVE-2026-22323) relates to Cross‑Site Request Forgery in the web-based management of the device. All vulnerabilities have been resolved in firmware version 3.53.

Ein entfernter, authentisierter oder anonymer Angreifer kann mehrere Schwachstellen in Phoenix Contact FL SWITCH ausnutzen, um beliebigen Programmcode mit Administratorrechten auszuführen, einen Denial-of-Service-Zustand zu verursachen, Cross-Site-Scripting-Angriffe durchzuführen oder Daten zu manipulieren.