Summary
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.
Details
Impact
Availability, integrity, or confidentiality of the FL SWITCH 2xxx, FL SWITCH TSN 23xx and FL SWITCH 59xx can be compromised by attacks using these vulnerabilities.
Remediation
Phoenix Contact recommends to update to the latest 3.53 Firmware Release which fixes these vulnerabilities.
Vulnerabilities 8
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High 7.2
Command Injection Vulnerability in Root CA Certificate Transfer Workflow
A command injection vulnerability in the device’s Root CA certificate transfer workflow allows a high-privileged attacker to send crafted HTTP POST requests that result in arbitrary command execution on the underlying Linux OS with root privileges.
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High 7.1
Stored Cross‑Site Scripting in Link Aggregation Name Handling
A stored cross‑site scripting (XSS) vulnerability in the Link Aggregation configuration interface allows an unauthenticated remote attacker to create a trunk entry containing malicious HTML/JavaScript code. When the affected page is viewed, the injected scrip…
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High 7.1
Cross‑Site Request Forgery in Link Aggregation Configuration
A CSRF vulnerability in the Link Aggregation configuration interface allows an unauthenticated remote attacker to trick authenticated users into sending unauthorized POST requests to the device by luring them to a malicious webpage. This can silently alter th…
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Medium 6.5
Buffer Overflow using TFTP Filename
A remote attacker with user privileges for the webUI can use the setting of the TFTP Filename with a POST Request to trigger a stack-based Buffer Overflow, resulting in a DoS attack.
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Medium 6.5
Stack-Based Buffer Overflow in TFTP File-Transfer Command Handling over CLI
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 …
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Medium 5.3
Stack-Based Buffer Overflow in CLI Login Username Handling over CLI
A stack-based buffer overflow in the device's Telnet/SSH CLI login routine occurs when a unauthenticated attacker send an oversized or unexpected username input. An overflow condition crashes the thread handling the login attempt, forcing the session to close…
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Medium 4.9
Stack-Based Buffer Overflow in File Transfer Parameter Handling
A stack-based buffer overflow vulnerability in the device's file transfer parameter workflow allows a high-privileged attacker to send oversized POST parameters, causing memory corruption in an internal process, resulting in a DoS attack.
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Medium 4.9
Stack-Based Buffer Overflow in File Install Parameter Handling
A stack-based buffer overflow in the device's file installation workflow allows a high-privileged attacker to send oversized POST parameters that overflow a fixed-size stack buffer within an internal process, resulting in a DoS attack.
Revision history
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#1.0.0
Initial release.
References
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PCSA-2025-00022
https://phoenixcontact.com/psirt
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Phoenix Contact advisory overview at CERT@VDE
https://certvde.com/de/advisories/vendor/phoenixcontact/
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Phoenix Contact application note
https://dam-mdc.phoenixcontact.com/asset/156443151564/0a870ae433c19148b80bd760f3a1c1f2/107913_en_03.pdf
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VDE-2025-104: Phoenix Contact: Multiple Vulnerabilities in FL SWITCH 2xxx, FL SWITCH TSN 23xx and FL SWITCH 59xx Firmware - HTML
https://certvde.com/en/advisories/VDE-2025-104