CVE-2026-20819

Untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to disclose information locally.

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20819	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:microsoft:windows_11_23h2::::::::
	cpe:2.3:o:microsoft:windows_11_24h2::::::::
	cpe:2.3:o:microsoft:windows_11_25h2::::::::

History

17 Jun 2026, 10:17

Type	Values Removed	Values Added
Summary		(es) Desreferencia de puntero no confiable en el enclave de Seguridad Basada en Virtualización (VBS) de Windows permite a un atacante autorizado divulgar información localmente.

14 Jan 2026, 20:33

Type	Values Removed	Values Added
References	~~() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20819 -~~	() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20819 - Vendor Advisory
First Time		Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft
CPE		cpe:2.3:o:microsoft:windows_11_23h2:::::::: cpe:2.3:o:microsoft:windows_11_24h2:::::::: cpe:2.3:o:microsoft:windows_11_25h2::::::::

13 Jan 2026, 18:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-01-13 18:16

Updated : 2026-07-30 21:16

NVD link : CVE-2026-20819

Mitre link : CVE-2026-20819

CVE.ORG link : CVE-2026-20819

JSON object : View

Products Affected

microsoft

windows_11_25h2
windows_11_24h2
windows_11_23h2

CWE

CWE-822

Untrusted Pointer Dereference

{"id": "CVE-2026-20819", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-20819", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-01-13T19:39:02.085014Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "affected": [{"source": "secure@microsoft.com", "affectedData": [{"vendor": "Microsoft", "product": "Windows 11 version 23H2", "versions": [{"status": "affected", "version": "10.0.22631.0", "lessThan": "10.0.22631.6491", "versionType": "custom"}], "platforms": ["ARM64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows 11 Version 23H2", "versions": [{"status": "affected", "version": "10.0.22631.0", "lessThan": "10.0.22631.6491", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows 11 Version 24H2", "versions": [{"status": "affected", "version": "10.0.26100.0", "lessThan": "10.0.26100.7623", "versionType": "custom"}], "platforms": ["ARM64-based Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Windows 11 Version 25H2", "versions": [{"status": "affected", "version": "10.0.26200.0", "lessThan": "10.0.26200.7623", "versionType": "custom"}], "platforms": ["ARM64-based Systems", "x64-based Systems"]}]}], "published": "2026-01-13T18:16:08.983", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20819", "tags": ["Vendor Advisory"], "source": "secure@microsoft.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-822"}]}], "descriptions": [{"lang": "en", "value": "Untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to disclose information locally."}, {"lang": "es", "value": "Desreferencia de puntero no confiable en el enclave de Seguridad Basada en Virtualizaci\u00f3n (VBS) de Windows permite a un atacante autorizado divulgar informaci\u00f3n localmente."}], "lastModified": "2026-07-30T21:16:58.433", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8D675DAA-4DCE-4727-BE5F-C954BBD252C4", "versionEndExcluding": "10.0.22631.6491"}, {"criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D249551B-1433-4E5E-A587-40F782E91E09", "versionEndExcluding": "10.0.26100.7623"}, {"criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "22082D4E-E68F-4E48-98FB-42DFDEE2E2A8", "versionEndExcluding": "10.0.26200.7623"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}