CVE-2026-45498

Microsoft Defender Denial of Service Vulnerability

CVSS v3 4.0 MEDIUM

4.0^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.5 / Impact : 1.4

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498	Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45498	Third Party Advisory US Government Resource

Configurations

Configuration 1 (hide)

cpe:2.3:a:microsoft:defender_antimalware_platform:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-20 13:16

Updated : 2026-07-23 12:10

NVD link : CVE-2026-45498

Mitre link : CVE-2026-45498

CVE.ORG link : CVE-2026-45498

JSON object : View

Products Affected

microsoft

defender_antimalware_platform

CWE

CWE-400

Uncontrolled Resource Consumption

{"id": "CVE-2026-45498", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-45498", "role": "CISA Coordinator", "options": [{"exploitation": "active"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-21T03:55:25.304447Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.0, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 2.5}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "secure@microsoft.com", "affectedData": [{"vendor": "Microsoft", "product": "Microsoft Defender Antimalware Platform", "versions": [{"status": "affected", "version": "4.0.0.0", "lessThan": "4.18.26040.7", "versionType": "custom"}]}]}], "published": "2026-05-20T13:16:36.780", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498", "tags": ["Vendor Advisory"], "source": "secure@microsoft.com"}, {"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45498", "tags": ["Third Party Advisory", "US Government Resource"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-400"}]}], "descriptions": [{"lang": "en", "value": "Microsoft Defender Denial of Service Vulnerability"}, {"lang": "es", "value": "Vulnerabilidad de denegaci\u00f3n de servicio de Microsoft Defender"}], "lastModified": "2026-07-23T12:10:00.110", "cisaActionDue": "2026-06-03", "cisaExploitAdd": "2026-05-20", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:defender_antimalware_platform:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7DBA2812-3139-4628-9CE5-FB2241242A6C", "versionEndExcluding": "4.18.26040.7"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com", "cisaRequiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.", "cisaVulnerabilityName": "Microsoft Defender Denial of Service Vulnerability"}