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01 Record

CVE-2021-34585

CODESYS V2 web server: crafted requests could trigger a pointer dereference with an invalid address (DoS)

HighPUBLISHEDCNA: CERTVDE
CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

02 Description

CODESYS V2 web server: crafted requests could trigger a pointer dereference with an invalid address (DoS)

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
0.90% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 59.6% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/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 21:58Z2 YR AGO
Reserved
2021-06-10
Assigning CNA
CERTVDE
Record state
PUBLISHED
Severity
High (CVSS 7.5)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
Data version
5.1
Document digest
b267bb40e7a6bff17d09f637b4dc52b8d1bb89d16db0e141726c8e80108ad0ad

05 Affected products

VendorProductVersionsPlatforms
CODESYSCODESYS V2all web servers to < V1.1.9.22—

06 References

07 Remediation

CODESYS GmbH has released version V1.1.9.22 of the CODESYS V2 web server to solve the noted vulnerability issues. This version of the CODESYS V2 web server is also part of the CODESYS Development System setup version V2.3.9.68.