CVE-2020-12521

6.5 mediumEPSS 0.5%

Medium (6.5) in phoenixcontact plcnext firmware. EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

6.5 medium

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 39% of CVEs (scores of 2026-10-31)
CWE: CWE-20
Published: 2020-12-17
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

phoenixcontact:plcnext_firmware

References

https://cert.vde.com/en-us/advisories/vde-2020-049
https://cert.vde.com/en-us/advisories/vde-2020-049

Check your stack JSON