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CVE-2026-45498: Microsoft Defender Denial of Service Vulnerability
Microsoft Defender · in CISA KEV since 2026-05-20
2026-05-20added to KEV
2026-06-03federal remediation due date
63.08%EPSS exploit probability (30 days) 99.2th percentile
7.5 HIGHCVSS 3.1
Unknownknown ransomware use
0days from NVD publication to KEV
What it is
Microsoft Defender contains an unspecified vulnerability that allows for denial of service.
Required action (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
| CWE | CWE-400 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD published | 2026-05-20 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2026-45498.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.
Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.