Vulnerability-Lookup

FKIE_CVE-2021-34593

Vulnerability from fkie_nvd - Published: 2021-10-26 10:15 - Updated: 2026-06-17 03:56

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

In CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56 unauthenticated crafted invalid requests may result in several denial-of-service conditions. Running PLC programs may be stopped, memory may be leaked, or further communication clients may be blocked from accessing the PLC.

References

URL	Tags
info@cert.vde.com	http://packetstormsecurity.com/files/164716/CODESYS-2.4.7.0-Denial-Of-Service.html	Exploit, Third Party Advisory, VDB Entry
info@cert.vde.com	http://packetstormsecurity.com/files/165874/WAGO-750-8xxx-PLC-Denial-Of-Service-User-Enumeration.html	Exploit, Third Party Advisory, VDB Entry
info@cert.vde.com	http://seclists.org/fulldisclosure/2021/Oct/64	Mailing List, Third Party Advisory
info@cert.vde.com	https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16877&token=8faab0fc1e069f4edfca5d5aba8146139f67a175&download=	Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	http://packetstormsecurity.com/files/164716/CODESYS-2.4.7.0-Denial-Of-Service.html	Exploit, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108	http://packetstormsecurity.com/files/165874/WAGO-750-8xxx-PLC-Denial-Of-Service-User-Enumeration.html	Exploit, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108	http://seclists.org/fulldisclosure/2021/Oct/64	Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16877&token=8faab0fc1e069f4edfca5d5aba8146139f67a175&download=	Vendor Advisory

Impacted products

Vendor	Product	Version
wago	750-8202_firmware	*
wago	750-8202	-
wago	750-8203_firmware	*
wago	750-8203	-
wago	750-8204_firmware	*
wago	750-8204	-
wago	750-8206_firmware	*
wago	750-8206	-
wago	750-8207_firmware	*
wago	750-8207	-
wago	750-8208_firmware	*
wago	750-8208	-
wago	750-8210_firmware	*
wago	750-8210	-
wago	750-8211_firmware	*
wago	750-8211	-
wago	750-8212_firmware	*
wago	750-8212	-
wago	750-8213_firmware	*
wago	750-8213	-
wago	750-8214_firmware	*
wago	750-8214	-
wago	750-8216_firmware	*
wago	750-8216	-
wago	750-8217_firmware	*
wago	750-8217	-
codesys	plcwinnt	*
codesys	runtime_toolkit	*

JSON

To clipboard

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          "product": "CODESYS V2",
          "vendor": "CODESYS",
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            },
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56 unauthenticated crafted invalid requests may result in several denial-of-service conditions. Running PLC programs may be stopped, memory may be leaked, or further communication clients may be blocked from accessing the PLC."
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    }
  ],
  "id": "CVE-2021-34593",
  "lastModified": "2026-06-17T03:56:11.963",
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    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
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          "baseScore": 5.0,
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          "integrityImpact": "NONE",
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        "obtainAllPrivilege": false,
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        "source": "nvd@nist.gov",
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          "baseScore": 7.5,
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  "published": "2021-10-26T10:15:08.013",
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}

CVE-2021-34593 (GCVE-0-2021-34593)

Vulnerability from cvelistv5 – Published: 2021-10-26 09:55 – Updated: 2024-09-17 04:10

Title

CODESYS V2 runtime: unauthenticated invalid requests may result in denial-of-service

Summary

Severity

7.5 (High)


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

CWE

CWE-755 - Improper Handling of Exceptional Conditions

Assigner

CERTVDE icscert root

References

4 references

URL	Tags
https://customers.codesys.com/index.php?eID=dumpF…	x_refsource_CONFIRM
http://seclists.org/fulldisclosure/2021/Oct/64	mailing-listx_refsource_FULLDISC
http://packetstormsecurity.com/files/164716/CODES…	x_refsource_MISC
http://packetstormsecurity.com/files/165874/WAGO-…	x_refsource_MISC

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 discovered by Steffen Robertz and Gerhard Hechenberger from the SEC Consult Vulnerability Lab.

Show details on NVD website

JSON

To clipboard

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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.