Vulnerability-Lookup

VAR-202110-1143

Vulnerability from variot - Updated: 2025-08-16 23:19

A crafted request with invalid offsets may cause an out-of-bounds read or write access in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56, resulting in a denial-of-service condition or local memory overwrite. CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT contains a vulnerability related to the use of out-of-bounds pointer offsets.Information is tampered with and service operation is interrupted (DoS) It may be in a state

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CVE-2021-34595 (GCVE-0-2021-34595)

Vulnerability from cvelistv5 – Published: 2021-10-26 09:55 – Updated: 2024-09-17 03:42

Title

CODESYS V2 runtime: out-of-bounds read or write access may result in denial-of-service

Summary

Severity

8.1 (High)


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

CWE

CWE-823 - Use of Out-of-range Pointer Offset

Assigner

CERTVDE icscert root

References

1 reference

URL	Tags
https://customers.codesys.com/index.php?eID=dumpF…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
CODESYS	CODESYS V2	Affected: Runtime Toolkit 32 bit full , < V2.4.7.56 (custom) Affected: PLCWinNT , < V2.4.7.56 (custom)

Date Public

2021-10-25 00:00

Credits

This issue was reported by Chen Jie and Gao Jian of NSFOCUS.

Show details on NVD website

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.