CVE-2020-12521

MediumCVSS 6.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-20

Affected software

No affected versions have been published.

Timeline

Published: Dec 17, 2020
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2020

CVE-2020-125229.8The reported vulnerability allows an attacker who has network access to the device to execute code with specially crafted packets in WAGO Se CVE-2020-125239.1On Phoenix Contact mGuard Devices versions before 8.8.3 LAN ports get functional after reboot even if they are disabled in the device config CVE-2020-125247.5Uncontrolled Resource Consumption can be exploited to cause the Phoenix Contact HMIs BTP 2043W, BTP 2070W and BTP 2102W in all versions to b CVE-2020-125257.8M&M Software fdtCONTAINER Component in versions below 3.5.20304.x and between 3.6 and 3.6.20304.x is vulnerable to deserialization of untrus CVE-2020-125265.3TwinCAT OPC UA Server in versions up to 2.3.0.12 and IPC Diagnostics UA Server in versions up to 3.1.0.1 from Beckhoff Automation GmbH & Co.CVE-2020-125276.5An issue was discovered in MB connect line mymbCONNECT24, mbCONNECT24 and Helmholz myREX24 and myREX24.virtual in all versions through v2.11 CVE-2020-125287.7An issue was discovered in MB connect line mymbCONNECT24 and mbCONNECT24 software in all versions through V2.6.2. Improper use of access val CVE-2020-125295.3An issue was discovered in MB connect line mymbCONNECT24 and mbCONNECT24 software in all versions through V2.6.2 There is a SSRF in the LDAP CVE-2020-12536.7An elevation of privilege vulnerability exists in Windows when the Windows kernel-mode driver fails to properly handle objects in memory, ak CVE-2020-125306.1An issue was discovered in MB connect line mymbCONNECT24 and mbCONNECT24 software in all versions through V2.6.2. There is an XSS issue in t CVE-2020-12547.8An elevation of privilege vulnerability exists when Windows Modules Installer Service improperly handles class object members.A locally auth CVE-2020-12558.8An elevation of privilege vulnerability exists when the Windows Background Intelligent Transfer Service (BITS) IIS module improperly handles