CVE-2021-42029 (GCVE-0-2021-42029)
Vulnerability from cvelistv5 – Published: 2022-04-12 09:07 – Updated: 2024-08-04 03:22
VLAI
EPSS
VEX
Summary
A vulnerability has been identified in SIMATIC STEP 7 (TIA Portal) V15 (All versions), SIMATIC STEP 7 (TIA Portal) V16 (All versions < V16 Update 5), SIMATIC STEP 7 (TIA Portal) V17 (All versions < V17 Update 2). An attacker could achieve privilege escalation on the web server of certain devices due to improper access control vulnerability in the engineering system software. The attacker needs to have direct access to the impacted web server.
Severity
7.8 (High)
CWE
- CWE-284 - Improper Access Control
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://cert-portal.siemens.com/productcert/pdf/s… | x_refsource_MISC |
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Siemens | SIMATIC STEP 7 (TIA Portal) V15 |
Affected:
All versions
|
guessed | |
| Siemens | SIMATIC STEP 7 (TIA Portal) V16 |
Affected:
All versions < V16 Update 5
|
guessed | |
| Siemens | SIMATIC STEP 7 (TIA Portal) V17 |
Affected:
All versions < V17 Update 2
|
guessed |
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"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1517-3_dp:-:*:*:*:*:*:*:*",
"matchCriteriaId": "ABE53C35-490A-498B-8CAB-B874C0E17AF1",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1517-3_pn:-:*:*:*:*:*:*:*",
"matchCriteriaId": "4C44E126-E4D9-44D8-B8B9-10F060D63A2B",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1517-3_pn\\/dp:-:*:*:*:*:*:*:*",
"matchCriteriaId": "984F6E53-482D-4282-BBAA-87B0375310FA",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1517f-3:-:*:*:*:*:*:*:*",
"matchCriteriaId": "3F4C4030-4BFE-4EA0-9967-F77EEB5113E0",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1517f-3_pn\\/dp:-:*:*:*:*:*:*:*",
"matchCriteriaId": "DB2327DF-ADA4-453E-A35E-E986D822F1E7",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1517tf-3:-:*:*:*:*:*:*:*",
"matchCriteriaId": "E1BD045A-0DC6-4D6F-A596-B24ECA84936B",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518:-:*:*:*:*:*:*:*",
"matchCriteriaId": "BE0BA68C-EB57-49CE-94A8-E7905AB79824",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518-4:-:*:*:*:*:*:*:*",
"matchCriteriaId": "836BC49A-F358-410D-A5CC-D62DAC7D624F",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518-4_dp:-:*:*:*:*:*:*:*",
"matchCriteriaId": "6772D5F3-35EE-4C94-B6D5-31500F440CCF",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518-4_pn:-:*:*:*:*:*:*:*",
"matchCriteriaId": "4245AED2-3F58-40D0-BF8A-8E930E1730B7",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518-4_pn\\/dp:-:*:*:*:*:*:*:*",
"matchCriteriaId": "40F38253-92F5-4A3A-AA07-292F7542D8A6",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518-4_pn\\/dp_mfp:-:*:*:*:*:*:*:*",
"matchCriteriaId": "3BC4FA01-8DDB-41E4-B759-7B504F78AEBC",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518f-4:-:*:*:*:*:*:*:*",
"matchCriteriaId": "1F37885E-AC96-4043-892F-55AEFAFA675D",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518f-4_pn\\/dp:-:*:*:*:*:*:*:*",
"matchCriteriaId": "DB469732-E3C2-45BC-8F65-C1B6A676A974",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518hf-4:-:*:*:*:*:*:*:*",
"matchCriteriaId": "914D507E-5C6E-4BA7-B5EA-549A01E0C34D",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518t-4:-:*:*:*:*:*:*:*",
"matchCriteriaId": "7EF0A62F-8EC0-4EB8-821A-14B17D87DD8A",
"vulnerable": false
},
{
"criteria": "cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518tf-4:-:*:*:*:*:*:*:*",
"matchCriteriaId": "223AA9C0-89FA-459D-949F-FB9D3551C06F",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability has been identified in SIMATIC STEP 7 (TIA Portal) V15 (All versions), SIMATIC STEP 7 (TIA Portal) V16 (All versions \u003c V16 Update 5), SIMATIC STEP 7 (TIA Portal) V17 (All versions \u003c V17 Update 2). An attacker could achieve privilege escalation on the web server of certain devices due to improper access control vulnerability in the engineering system software. The attacker needs to have direct access to the impacted web server."
},
{
"lang": "es",
"value": "Se ha identificado una vulnerabilidad en SIMATIC STEP 7 (TIA Portal) versi\u00f3n V15 (Todas las versiones), SIMATIC STEP 7 (TIA Portal) versi\u00f3n V16 (todas las versiones anteriores a versi\u00f3n V16 Update 5), SIMATIC STEP 7 (TIA Portal) versi\u00f3n V17 (todas las versiones anteriores a versi\u00f3n V17 Update 2). Un atacante podr\u00eda lograr una escalada de privilegios en el servidor web de determinados dispositivos debido a una vulnerabilidad de control de acceso inapropiada en el software del sistema de ingenier\u00eda. El atacante necesita tener acceso directo al servidor web afectado"
}
],
"id": "CVE-2021-42029",
"lastModified": "2026-06-17T04:09:12.200",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "HIGH",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "LOCAL",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 7.2,
"confidentialityImpact": "COMPLETE",
"integrityImpact": "COMPLETE",
"vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
"version": "2.0"
},
"exploitabilityScore": 3.9,
"impactScore": 10.0,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2022-04-12T09:15:13.817",
"references": [
{
"source": "productcert@siemens.com",
"tags": [
"Patch",
"Vendor Advisory"
],
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-350757.pdf"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch",
"Vendor Advisory"
],
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-350757.pdf"
}
],
"sourceIdentifier": "productcert@siemens.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-284"
}
],
"source": "productcert@siemens.com",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-Other"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"current_release_date": "2026-03-27T13:27:42+00:00",
"cve": "CVE-2021-42029",
"id": "CVE-2021-42029",
"initial_release_date": "2021-01-01T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "CVE-2021-42029",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-42029.json",
"version": "3"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.