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01 Record

CVE-2021-34596

CODESYS V2 runtime: Access of Uninitialized Pointer may result in denial-of-service

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

02 Description

CODESYS V2 runtime: Access of Uninitialized Pointer may result in denial-of-service

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
0.83% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 57.4% 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:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD analysis status
Analyzed. 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
2021-10-26 09:55Z5 YR AGO
Last updated
2024-09-16 22:40Z2 YR AGO
Reserved
2021-06-10
Assigning CNA
CERTVDE
Record state
PUBLISHED
Severity
Medium (CVSS 6.5)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weaknesses
  • CWE-824Access of Uninitialized PointerBase
Data version
5.1
Document digest
c630baa3fdc8a19e7714ab185528ada171ebf044a46659cbe484be8b3e839b95

05 Affected products

VendorProductVersionsPlatforms
CODESYSCODESYS V2Runtime Toolkit 32 bit full to < V2.4.7.56, PLCWinNT to < V2.4.7.56—

06 References

07 Remediation

CODESYS GmbH has released the following product versions to solve the noted vulnerability issue for the affected CODESYS products: * CODESYS Runtime Toolkit 32 bit full version V2.4.7.56 * CODESYS PLCWinNT version V2.4.7.56. This will also be part of the CODESYS Development System setup version V2.3.9.68.