CVE-2020-12521

Phoenix Contact PLCnext Control Devices versions before 2021.0 LTS: A specially crafted LLDP packet may lead to a high system load in the PROFINET stack.

MEDIUM

6.5

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

MEDIUM6.5

Exploit prediction

EPSS 0.5%

Description

On Phoenix Contact PLCnext Control Devices versions before 2021.0 LTS a specially crafted LLDP packet may lead to a high system load in the PROFINET stack. An attacker can cause failure of system services or a complete reboot.

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