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CVE-2026-45498— Microsoft Defender Denial of Service Vulnerability

Quick assessment

Affected
Microsoft Microsoft Defender Antimalware Platform
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Defender是美国微软（Microsoft）公司的一款威胁防护软件。 Microsoft Defender存在安全漏洞，该漏洞源于拒绝服务。

CVSS 4.0 · Medium KEV EPSS 63.08% · P99

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
Microsoft Microsoft Defender Antimalware Platform 4.0.0.0< 4.18.26040.7 affected
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I. Basic Information for CVE-2026-45498

Vulnerability Information
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Vulnerability Title
Microsoft Defender Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Microsoft Defender Denial of Service Vulnerability
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Defender 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Defender是美国微软（Microsoft）公司的一款威胁防护软件。 Microsoft Defender存在安全漏洞，该漏洞源于拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft Defender Antimalware Platform 4.0.0.0 ~ 4.18.26040.7 -

II. Public POCs for CVE-2026-45498

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III. Intelligence Information for CVE-2026-45498

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Vendor Advisories for CVE-2026-45498 (1)

Same Patch Batch · Microsoft · 2026-05-20 · 4 CVEs total

CVE-2026-45584 8.1 HIGH Microsoft Defender Remote Code Execution Vulnerability
CVE-2026-42834 7.8 HIGH Windows Admin Center in Azure Portal Elevation of Privilege Vulnerability
CVE-2026-41091 7.8 HIGH Microsoft Defender Elevation of Privilege Vulnerability

IV. Related Vulnerabilities

Same product: Microsoft Defender Antimalware Platform
Same vendor: Microsoft
Same weakness: CWE-400

V. Comments for CVE-2026-45498

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