CVE-2020-1109

An elevation of privilege vulnerability exists when the Windows Update Stack fails to properly handle objects in memory. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application to take control of an affected system. The update addresses the vulnerability by correcting how the Windows Update Stack handles objects in memory.

CVSS v3 7.8 HIGH
CVSS v2.0 7.2 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.2^/10

CVSS v2.0 : HIGH

Vector : AV:L/AC:L/Au:N/C:C/I:C/A:C

Exploitability : 3.9 / Impact : 10.0

Access Vector LOCAL

Access Complexity LOW

Authentication NONE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1109
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1109	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:microsoft:windows_10:1709:::::::*
	cpe:2.3:o:microsoft:windows_10:1803:::::::*
	cpe:2.3:o:microsoft:windows_10:1809:::::::*
	cpe:2.3:o:microsoft:windows_10:1903:::::::*
	cpe:2.3:o:microsoft:windows_10:1909:::::::*
	cpe:2.3:o:microsoft:windows_server_2019:-:::::::*

History

No history.

Information

Published : 2020-05-21 23:15

Updated : 2026-08-19 17:17

NVD link : CVE-2020-1109

Mitre link : CVE-2020-1109

CVE.ORG link : CVE-2020-1109

JSON object : View

Products Affected

microsoft

windows_server_2019
windows_10

CWE

NVD-CWE-noinfo

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"LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}, {"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:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "secure@microsoft.com", "affectedData": [{"vendor": "Microsoft", "product": "Windows 10 Version 1709", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["ARM64-based Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows 10 Version 1709 for 32-bit Systems", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["32-bit Systems"]}, {"vendor": "Microsoft", "product": "Windows 10 Version 1803", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["32-bit Systems", "ARM64-based Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows 10 Version 1809", "versions": [{"status": "affected", "version": "10.0.17763.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["32-bit Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows 10 Version 1809", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["ARM64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows 10 Version 1903 for 32-bit Systems", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": "Windows 10 Version 1903 for ARM64-based Systems", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": "Windows 10 Version 1903 for x64-based Systems", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": "Windows 10 Version 1909", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["32-bit Systems", "ARM64-based Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows Server 2019", "versions": [{"status": "affected", "version": "10.0.17763.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows Server 2019 (Server Core installation)", "versions": [{"status": "affected", "version": "10.0.17763.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows Server, version 1803 (Server Core Installation)", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows Server, version 1903 (Server Core installation)", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows Server, version 1909 (Server Core installation)", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "publication", "versionType": "custom"}], "platforms": ["x64-based Systems"]}]}], "published": "2020-05-21T23:15:14.930", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1109", "source": "secure@microsoft.com"}, {"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1109", "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": "An elevation of privilege vulnerability exists when the Windows Update Stack fails to properly handle objects in memory. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.\nTo exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application to take control of an affected system.\nThe update addresses the vulnerability by correcting how the Windows Update Stack handles objects in memory."}, {"lang": "es", "value": "Se presenta una vulnerabilidad de elevaci\u00f3n de privilegios cuando la Windows Update Stack presenta un fallo al manejar apropiadamente objetos en memoria, tambi\u00e9n se conoce como \"Windows Update Stack Elevation of Privilege Vulnerability\". Este ID de CVE es diferente de CVE-2020-1110."}], "lastModified": "2026-08-19T17:17:18.517", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:microsoft:windows_10:1709:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "83B14968-3985-43C3-ACE5-8307196EFAE3"}, {"criteria": "cpe:2.3:o:microsoft:windows_10:1803:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7CB85C75-4D35-480E-843D-60579EC75FCB"}, {"criteria": "cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6B8F3DD2-A145-4AF1-8545-CC42892DA3D1"}, {"criteria": "cpe:2.3:o:microsoft:windows_10:1903:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3FB5CDAE-C713-4D9D-9D6A-2C2E8924A4BB"}, {"criteria": "cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E9273B95-20ED-4547-B0A8-95AD15B30372"}, {"criteria": "cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DB79EE26-FC32-417D-A49C-A1A63165A968"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}