{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-66334", "assignerOrgId": "7e9044f1-7f56-4c38-8864-c0c7302263d6", "state": "PUBLISHED", "assignerShortName": "AMI", "dateReserved": "2026-07-24T21:31:28.218Z", "datePublished": "2026-11-10T16:22:38.610Z", "dateUpdated": "2026-11-10T16:22:38.610Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "7e9044f1-7f56-4c38-8864-c0c7302263d6", "shortName": "AMI", "dateUpdated": "2026-11-10T16:22:38.610Z"}, "title": "OFBD SMM Write Validation Issues", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds write", "type": "CWE"}]}], "affected": [{"vendor": "AMI", "product": "AptioV", "versions": [{"status": "affected", "version": "AptioV_5.0", "lessThan": "AptioV_5.046", "versionType": "custom"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "AMI APTIOV contains vulnerabilities in BIOS where\nprivileged users may cause the \u201cOut-of-Bounds Write\u201d by\nlocal access. Successful exploitation of this vulnerability may lead to a\ndenial of service during firmware update processing, such as a crash or failed\nupdate if the out-of-bounds write hits unmapped memory. It could also impact Integrity, and Availability.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>AMI APTIOV contains vulnerabilities in BIOS where\nprivileged users may cause the \u201cOut-of-Bounds Write\u201d by\nlocal access. Successful exploitation of this vulnerability may lead to a\ndenial of service during firmware update processing, such as a crash or failed\nupdate if the out-of-bounds write hits unmapped memory. It could also impact Integrity, and Availability.</p>"}]}], "references": [{"url": "https://go.ami.com/hubfs/Security%20Advisories/2026/AMI-SA-2026003.pdf"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 6.8, "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N"}}], "credits": [{"lang": "en", "value": "Zhenyu Liu", "type": "finder"}, {"lang": "en", "value": "Huafeng Wang", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "AptioV", "vendor": "AMI", "versions": [{"lessThan": "AptioV_5.046", "status": "affected", "version": "AptioV_5.0", "versionType": "custom"}]}], "source": "biossecurity@ami.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "AMI APTIOV contains vulnerabilities in BIOS where\nprivileged users may cause the \u201cOut-of-Bounds Write\u201d by\nlocal access. Successful exploitation of this vulnerability may lead to a\ndenial of service during firmware update processing, such as a crash or failed\nupdate if the out-of-bounds write hits unmapped memory. It could also impact Integrity, and Availability."}], "id": "CVE-2026-66334", "lastModified": "2026-11-10T17:17:46.733", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "HIGH", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "biossecurity@ami.com", "type": "Secondary"}]}, "published": "2026-11-10T17:17:46.733", "references": [{"source": "biossecurity@ami.com", "url": "https://go.ami.com/hubfs/Security%20Advisories/2026/AMI-SA-2026003.pdf"}], "sourceIdentifier": "biossecurity@ami.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "biossecurity@ami.com", "type": "Secondary"}]}

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