CVE-2026-45498

Microsoft Defender Denial of Service Vulnerability

Basic Information

CVE State: PUBLISHED
Reserved Date: May 12, 2026
Published Date: May 20, 2026
Last Updated: May 27, 2026
Vendor: Microsoft
Product: Microsoft Defender Antimalware Platform
Description: Microsoft Defender Denial of Service Vulnerability
Tags

CVSS Scores

CVSS v3.1

4.0 - MEDIUM

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

SSVC Information

Exploitation: active
Technical Impact: partial

Exploit Status

Exploited in the Wild: Yes (2026-06-01 13:29:26 UTC) Source

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498

Known Exploited Vulnerability Information

Source	Added Date
CVE	2026-06-01 13:29:26 UTC

Timeline

CVE ID Reserved

May 12, 2026
CVE Published to Public

May 20, 2026
Added to KEVIntel

June 01, 2026