CVE-2023-20540

{"id": "CVE-2023-20540", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-20540", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-26T16:00:48.333509Z"}}], "cvssMetricV40": [{"type": "Secondary", "source": "psirt@amd.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 1.8, "Automatable": "NOT_DEFINED", "attackVector": "LOCAL", "baseSeverity": "LOW", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "psirt@amd.com", "affectedData": [{"vendor": "AMD", "product": "AMD Ryzen\u2122 3000 Series Desktop Processors", "versions": [{"status": "unaffected", "version": "ComboAM4 1.0.0.E"}, {"status": "unaffected", "version": "ComboAM4v2PI 1.2.0.CA"}], "defaultStatus": "affected"}, {"vendor": "AMD", "product": "AMD Ryzen\u2122 5000 Series Desktop Processors", "versions": [{"status": "unaffected", "version": "ComboAM4v2PI 1.2.0.CA"}], "defaultStatus": "affected"}, {"vendor": "AMD", "product": "AMD Ryzen\u2122 Threadripper\u2122 3000 Series Processors", "versions": [{"status": "unaffected", "version": "CastlePeakPI-SP3r3 1.0.0.C"}], "defaultStatus": "affected"}, {"vendor": "AMD", "product": "AMD Ryzen\u2122 Threadripper\u2122 PRO 3000WX Series Processors", "versions": [{"status": "unaffected", "version": "CastlePeakWSPI-sWRX8 1.0.0.E"}], "defaultStatus": "affected"}, {"vendor": "AMD", "product": "AMD Ryzen\u2122 Threadripper\u2122 PRO 5000 WX-Series Processors", "versions": [{"status": "unaffected", "version": "ChagallWSPI-sWRX8 1.0.0.9"}], "defaultStatus": "affected"}]}], "published": "2026-06-26T16:16:28.810", "references": [{"url": "https://www.amd.com/en/resources/product-security/bulletin/amd-sb-4012.html", "source": "psirt@amd.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "psirt@amd.com", "description": [{"lang": "en", "value": "CWE-208"}]}], "descriptions": [{"lang": "en", "value": "An observable timing discrepancy in the ASP could allow a privileged attacker to perform a brute-force attack against the hash message authentication code, allowing arbitrary message input, potentially leading to a loss of data integrity."}], "lastModified": "2026-06-26T20:04:17.603", "sourceIdentifier": "psirt@amd.com"}