CVE-2021-34570 (GCVE-0-2021-34570)
Vulnerability from cvelistv5 – Published: 2021-09-27 08:25 – Updated: 2024-09-16 22:09
VLAI
EPSS
VEX
Title
Phoenix Contact: DoS for PLCnext Control devices in versions prior to 2021.0.5 LTS
Summary
Multiple Phoenix Contact PLCnext control devices in versions prior to 2021.0.5 LTS are prone to a DoS attack through special crafted JSON requests.
Severity
7.5 (High)
CWE
- CWE-20 - Improper Input Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://cert.vde.com/en/advisories/VDE-2021-029/ | x_refsource_CONFIRM |
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Phoenix Contact | AXC F |
Affected:
AXC F 1152 (1151412) , < 2021.0.5 LTS
(custom)
Affected: AXC F 2152 (2404267) , < 2021.0.5 LTS (custom) Affected: AXC F 3152 (1069208) , < 2021.0.5 LTS (custom) Affected: AXC F 2152 Starterkit (1046568) , < 2021.0.5 LTS (custom) |
guessed | |
| Phoenix Contact | RFC |
Affected:
RFC 4072S (1051328) , < 2021.0.5 LTS
(custom)
|
guessed | |
| Phoenix Contact | PLCnext |
Affected:
PLCnext Technology Starterkit (1188165) , < 2021.0.5 LTS
(custom)
|
guessed |
Date Public
2021-08-03 00:00
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"operator": "OR"
}
],
"operator": "AND"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Multiple Phoenix Contact PLCnext control devices in versions prior to 2021.0.5 LTS are prone to a DoS attack through special crafted JSON requests."
},
{
"lang": "es",
"value": "M\u00faltiples dispositivos de control Phoenix Contact PLCnext en versiones anteriores a 2021.0.5 LTS, son propensos a un ataque DoS mediante peticiones JSON especialmente dise\u00f1adas"
}
],
"id": "CVE-2021-34570",
"lastModified": "2024-11-21T06:10:43.373",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "HIGH",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 7.8,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 6.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "info@cert.vde.com",
"type": "Secondary"
},
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2021-09-27T09:15:07.750",
"references": [
{
"source": "info@cert.vde.com",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://cert.vde.com/en/advisories/VDE-2021-029/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://cert.vde.com/en/advisories/VDE-2021-029/"
}
],
"sourceIdentifier": "info@cert.vde.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-20"
}
],
"source": "info@cert.vde.com",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"current_release_date": "2026-03-27T13:55:33+00:00",
"cve": "CVE-2021-34570",
"id": "CVE-2021-34570",
"initial_release_date": "2021-08-03T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "Phoenix Contact: DoS for PLCnext Control devices in versions prior to 2021.0.5 LTS",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-34570.json",
"version": "3"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
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.
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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.
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