CVE-2020-12517: Phoenixcontact Plcnext Firmware

Critical severity, CVSS 9.0. EPSS: 1.1% chance of exploitation in the next 30 days.

On Phoenix Contact PLCnext Control Devices versions before 2021.0 LTS an authenticated low privileged user could embed malicious Javascript code to gain admin rights when the admin user visits the vulnerable website (local privilege escalation).

Affected products

• Phoenixcontact Plcnext Firmware: before 2021.0 (fixed in 2021.0)

Published 2020-12-17. Last modified 2026-06-17.