Medium severity6.5NVD Advisory· Published Dec 17, 2020· Updated Jun 17, 2026
CVE-2020-12521
CVE-2020-12521
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.
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Affected products
8- cpe:2.3:o:phoenixcontact:plcnext_firmware:*:*:*:*:long_term_support:*:*:*Range: <2021.0
- Range: <2021.0 LTS
- Phoenix Contact/AXC F 1152 (1151412)v5Range: unspecified
- Range: unspecified
- Range: unspecified
- Phoenix Contact/AXC F 3152 (1069208)v5Range: unspecified
- Phoenix Contact/PLCnext Technology Starterkit (1188165)v5Range: unspecified
- Phoenix Contact/RFC 4072S (1051328v5Range: unspecified
Patches
Vulnerability mechanics
References
1- cert.vde.com/en-us/advisories/vde-2020-049nvdThird Party Advisory
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