{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-45584", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-05-12T19:55:45.729Z", "datePublished": "2026-05-20T13:09:44.329Z", "dateUpdated": "2026-05-20T14:50:10.132Z"}, "containers": {"cna": {"title": "Microsoft Defender Remote Code Execution Vulnerability", "datePublic": "2026-05-19T14:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:malware_protection_engine:*:*:*:*:*:*:*:*", "versionStartIncluding": "-"}]}]}], "affected": [{"vendor": "Microsoft", "product": "Microsoft Malware Protection Engine", "versions": [{"version": "-", "status": "affected"}]}], "descriptions": [{"value": "Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-122: Heap-based Buffer Overflow", "lang": "en-US", "type": "CWE", "cweId": "CWE-122"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-05-20T13:54:10.716Z"}, "references": [{"name": "Microsoft Defender Remote Code Execution Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45584"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "HIGH", "baseScore": 8.1, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C"}}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-20T14:49:11.305225Z", "id": "CVE-2026-45584", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-20T14:50:10.132Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-45584", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-05-20T14:49:11.305225Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-20T14:49:57.012Z"}}], "cna": {"title": "Microsoft Defender Remote Code Execution Vulnerability", "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "baseScore": 8.1, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C"}, "scenarios": [{"lang": "en-US", "value": "GENERAL"}]}], "affected": [{"vendor": "Microsoft", "product": "Microsoft Malware Protection Engine", "versions": [{"status": "affected", "version": "-"}]}], "datePublic": "2026-05-19T14:00:00.000Z", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45584", "name": "Microsoft Defender Remote Code Execution Vulnerability", "tags": ["vendor-advisory", "patch"]}], "descriptions": [{"lang": "en-US", "value": "Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network."}], "problemTypes": [{"descriptions": [{"lang": "en-US", "type": "CWE", "cweId": "CWE-122", "description": "CWE-122: Heap-based Buffer Overflow"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:malware_protection_engine:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "-"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-05-20T13:54:10.716Z"}}}, "cveMetadata": {"cveId": "CVE-2026-45584", "state": "PUBLISHED", "dateUpdated": "2026-05-20T14:50:10.132Z", "dateReserved": "2026-05-12T19:55:45.729Z", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "datePublished": "2026-05-20T13:09:44.329Z", "assignerShortName": "microsoft"}, "dataVersion": "5.2"}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network."}], "id": "CVE-2026-45584", "lastModified": "2026-05-20T13:57:15.740", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "secure@microsoft.com", "type": "Primary"}]}, "published": "2026-05-20T13:16:37.333", "references": [{"source": "secure@microsoft.com", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45584"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "secure@microsoft.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "malware_protection_engine", "vendor": "microsoft"}], "created": "2026-05-20T14:45:32.459900+00:00", "updated": "2026-05-20T14:45:32.836469+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$malware_protection_engine"]}