CVE-2020-12517

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).

CRITICAL

CVSS Score

Published: December 17, 2020 at 10:43 PM UTC

Updated: June 17, 2026 at 02:51 AM UTC

7 products affected across 1 vendorPlcnext FirmwareAXC F 2152RFC 4072S

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Severity

CRITICAL9

Exploit prediction

EPSS 1%

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Plcnext Firmware · Phoenix Contact

95%

v < 2021.0

Affected range stops below 2021.0, so it looks safe — our inference, not a vendor statement

phoenixcontact-axc-f-1152 (environment) · phoenixcontact-axc-f-2152 (environment) · phoenixcontact-axc-f-2152-starterkit (environment) · phoenixcontact-axc-f-3152 (environment) · phoenixcontact-rfc-4072s (environment) · phoenixcontact-plcnext-technology-starterkit (same device)

AXC F 1152 · Phoenix Contact

60%

v < 2021.0 LTS