CVE-2020-16934
Status: ModifiedHigh (7.8)—
<p>An elevation of privilege vulnerability exists in the way that Microsoft Office Click-to-Run (C2R) AppVLP handles certain files. An attacker who successfully exploited the vulnerability could elevate privileges.</p> <p>To exploit this vulnerability, an attacker would need to convince a user to open a specially crafted file.</p> <p>The security update addresses the vulnerability by correcting how Microsoft Office Click-to-Run (C2R) components handle these files.</p>
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Base score: 7.8
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 2.68%
- Percentile among all scored CVEs: 85
- Score date: 10/7/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (3)
CWEs
- NVD-CWE-noinfo
References
Raw JSON (NVD)
Show
{
"id": "CVE-2020-16934",
"cveTags": [],
"metrics": {
"cvssMetricV2": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"version": "2.0",
"baseScore": 6.8,
"accessVector": "NETWORK",
"vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
"authentication": "NONE",
"integrityImpact": "PARTIAL",
"accessComplexity": "MEDIUM",
"availabilityImpact": "PARTIAL",
"confidentialityImpact": "PARTIAL"
},
"acInsufInfo": false,
"impactScore": 6.4,
"baseSeverity": "MEDIUM",
"obtainAllPrivilege": false,
"exploitabilityScore": 8.6,
"obtainUserPrivilege": false,
"obtainOtherPrivilege": false,
"userInteractionRequired": true
}
],
"cvssMetricV31": [
{
"type": "Secondary",
"source": "secure@microsoft.com",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7,
"attackVector": "LOCAL",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "REQUIRED",
"attackComplexity": "HIGH",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 1
},
{
"type": "Secondary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.8,
"attackVector": "LOCAL",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "REQUIRED",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 1.8
}
]
},
"affected": [
{
"source": "secure@microsoft.com",
"affectedData": [
{
"cpes": [
"cpe:2.3:a:microsoft:office:2013:*:*:*:click-to-run:*:x86:*",
"cpe:2.3:a:microsoft:office:2013:*:*:*:click-to-run:*:x64:*"
],
"vendor": "Microsoft",
"product": "Microsoft Office 2013 Click-to-Run (C2R)",
"versions": [
{
"status": "affected",
"version": "15.0.0.0",
"lessThan": "15.0.5571.1000",
"versionType": "custom"
}
],
"platforms": [
"32-bit Systems",
"x64-based Systems"
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:*:*"
],
"vendor": "Microsoft",
"product": "Microsoft Office 2019",
"versions": [
{
"status": "affected",
"version": "19.0.0",
"lessThan": "https://aka.ms/OfficeSecurityReleases",
"versionType": "custom"
}
],
"platforms": [
"32-bit Systems",
"x64-based Systems"
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:*:*"
],
"vendor": "Microsoft",
"product": "Microsoft 365 Apps for Enterprise",
"versions": [
{
"status": "affected",
"version": "16.0.1",
"lessThan": "https://aka.ms/OfficeSecurityReleases",
"versionType": "custom"
}
],
"platforms": [
"32-bit Systems",
"x64-based Systems"
]
}
]
}
],
"published": "2020-10-16T23:15:15.413",
"references": [
{
"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16934",
"tags": [
"Patch",
"Vendor Advisory"
],
"source": "secure@microsoft.com"
},
{
"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16934",
"tags": [
"Patch",
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "<p>An elevation of privilege vulnerability exists in the way that Microsoft Office Click-to-Run (C2R) AppVLP handles certain files. An attacker who successfully exploited the vulnerability could elevate privileges.</p>\n<p>To exploit this vulnerability, an attacker would need to convince a user to open a specially crafted file.</p>\n<p>The security update addresses the vulnerability by correcting how Microsoft Office Click-to-Run (C2R) components handle these files.</p>"
},
{
"lang": "es",
"value": "Se presenta una vulnerabilidad de escalada de privilegios en la manera en que Microsoft Office Click-to-Run (C2R) AppVLP maneja determinados archivos, también se conoce como \"Microsoft Office Click-to-Run Elevation of Privilege Vulnerability\". Este ID de CVE es diferente de CVE-2020-16928, CVE-2020-16955"
}
],
"lastModified": "2026-06-17T02:58:18.177",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:*:*",
"vulnerable": true,
"matchCriteriaId": "40C15EDD-98D4-4D06-BA06-21AE0F33C72D"
},
{
"criteria": "cpe:2.3:a:microsoft:office:2019:*:*:*:*:-:*:*",
"vulnerable": true,
"matchCriteriaId": "C5282C83-86B8-442D-851D-B54E88E8B1F1"
},
{
"criteria": "cpe:2.3:a:microsoft:office_2013_click-to-run:-:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "578658ED-0C8A-411B-97B1-B780469D6459"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "secure@microsoft.com"
}