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Known exploited vulnerability · Microsoft

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

highCVSS 3.1 7.5Exploited

Microsoft Defender Denial of Service Vulnerability

Published May 20, 2026 · Updated Jul 23, 2026

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Advisory details

From the National Vulnerability Database. This product uses the NVD API but is not endorsed or certified by the NVD.

Microsoft Defender Denial of Service Vulnerability

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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