CVE-2026-45584

{"id": "CVE-2026-45584", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.2}]}, "published": "2026-05-20T13:16:37.333", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45584", "tags": ["Vendor Advisory"], "source": "secure@microsoft.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-122"}]}], "descriptions": [{"lang": "en", "value": "Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network."}], "lastModified": "2026-05-20T18:56:32.350", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:malware_protection_engine:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AD1882FA-1447-46F7-A592-142F55820A60", "versionEndExcluding": "1.1.26040.8", "versionStartIncluding": "1.1.26030.3008"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}