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Description

Microsoft Defender Denial of Service Vulnerability

PUBLISHED Reserved 2026-05-12 | Published 2026-05-20 | Updated 2026-05-20 | Assigner microsoft




MEDIUM: 4.0CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C

CISA Known Exploited Vulnerability

Date added 2026-05-20 | Due date 2026-06-03

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

Problem types

Denial of Service

Product status

-
affected

References

www.cisa.gov/...erabilities-catalog?field_cve=CVE-2026-45498 government-resource

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498 (Microsoft Defender Denial of Service Vulnerability) vendor-advisory patch

cve.org (CVE-2026-45498)

nvd.nist.gov (CVE-2026-45498)

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