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01 Record

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.

MediumPUBLISHEDCNA: CERTVDE
CNA base score6.5 CVSS v3.xCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

02 Description

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.

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
0.45% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 39.5% of scored records. A rank, not a probability.
NVD base score
6.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2020-12-17 22:43Z5 YR AGO
Last updated
2024-09-17 04:14Z2 YR AGO
Reserved
2020-04-30
Assigning CNA
CERTVDE
Record state
PUBLISHED
Severity
Medium (CVSS 6.5)
CNA CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
  • CWE-20Improper Input ValidationClass
Data version
5.1
Document digest
3dacdd26d0b5ef65439fca4fbbe293eecf4168f201e75247d71b7d6d5498676f

05 Affected products

VendorProductVersionsPlatforms
Phoenix ContactAXC F 1152 (1151412)< 2021.0 LTS—
Phoenix ContactAXC F 2152 (2404267)< 2021.0 LTS—
Phoenix ContactAXC F 3152 (1069208)< 2021.0 LTS—
Phoenix ContactRFC 4072S (1051328< 2021.0 LTS—
Phoenix ContactAXC F 2152 Starterkit (1046568)< 2021.0 LTS—
Phoenix ContactPLCnext Technology Starterkit (1188165)< 2021.0 LTS—

06 References

07 Remediation

Phoenix Contact recommends affected users to upgrade to the current Firmware 2021.0 LTS or higher which fixes these vulnerabilities.