FKIE_CVE-2021-36742
Vulnerability from fkie_nvd - Published: 2021-07-29 20:15 - Updated: 2026-06-17 03:59
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/
Summary
A improper input validation vulnerability in Trend Micro Apex One, Apex One as a Service, OfficeScan XG and Worry-Free Business Security 10.0 SP1 allows a local attacker to escalate privileges on affected installations. Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| trendmicro | officescan | xg | |
| trendmicro | officescan_business_security | 10.0 | |
| trendmicro | apex_one | 2019 | |
| trendmicro | worry-free_business_security | 10.0 | |
| microsoft | windows | - |
{
"affected": [
{
"affectedData": [
{
"product": "Trend Micro Apex One",
"vendor": "Trend Micro",
"versions": [
{
"status": "affected",
"version": "2019, SaaS"
}
]
},
{
"product": "Trend Micro OfficeScan",
"vendor": "Trend Micro",
"versions": [
{
"status": "affected",
"version": "XG SP1"
}
]
},
{
"product": "Trend Micro Worry-Free Business Security",
"vendor": "Trend Micro",
"versions": [
{
"status": "affected",
"version": "10.0 SP1"
}
]
}
],
"source": "security@trendmicro.com"
}
],
"cisaActionDue": "2021-11-17",
"cisaExploitAdd": "2021-11-03",
"cisaRequiredAction": "Apply updates per vendor instructions.",
"cisaVulnerabilityName": "Trend Micro Multiple Products Improper Input Validation Vulnerability",
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:trendmicro:officescan:xg:sp1:*:*:*:*:*:*",
"matchCriteriaId": "64600B42-4884-41F2-A683-AE1EDB79372E",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:trendmicro:officescan_business_security:10.0:sp1:*:*:*:*:*:*",
"matchCriteriaId": "762313F8-2BA6-4ED7-A977-56C962D5B27F",
"vulnerable": true
}
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"negate": false,
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}
]
},
{
"nodes": [
{
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"vulnerable": true
},
{
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"matchCriteriaId": "FFCE8717-85D2-4F4F-91DF-C6DA341C4E19",
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}
],
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"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A improper input validation vulnerability in Trend Micro Apex One, Apex One as a Service, OfficeScan XG and Worry-Free Business Security 10.0 SP1 allows a local attacker to escalate privileges on affected installations. Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability."
},
{
"lang": "es",
"value": "Una vulnerabilidad de comprobaci\u00f3n de entrada inapropiada en Trend Micro Apex One, Apex One as a Service, OfficeScan XG y Worry-Free Business Security versi\u00f3n 10.0 SP1, permite a un atacante local escalar privilegios en las instalaciones afectadas. Nota: un atacante debe obtener primero la habilidad de ejecutar c\u00f3digo poco privilegiado en el sistema objetivo para poder explotar esta vulnerabilidad"
}
],
"id": "CVE-2021-36742",
"lastModified": "2026-06-17T03:59:05.680",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "LOCAL",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 4.6,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "PARTIAL",
"vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P",
"version": "2.0"
},
"exploitabilityScore": 3.9,
"impactScore": 6.4,
"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"
},
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"impactScore": 5.9,
"source": "nvd@nist.gov",
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},
{
"cvssData": {
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"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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}
],
"ssvcV203": [
{
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"ssvcData": {
"id": "CVE-2021-36742",
"options": [
{
"exploitation": "active"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-02-06T19:39:21.806477Z",
"version": "2.0.3"
}
}
]
},
"published": "2021-07-29T20:15:07.650",
"references": [
{
"source": "security@trendmicro.com",
"tags": [
"Vendor Advisory"
],
"url": "https://success.trendmicro.com/jp/solution/000287796"
},
{
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{
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{
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},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"tags": [
"US Government Resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36742"
}
],
"sourceIdentifier": "security@trendmicro.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-20"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-20"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
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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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