CVE-2026-45498

MEDIUM KEV

Microsoft Defender Denial of Service Vulnerability

Title source: cna
STIX 2.1

Exploitation Summary

CVE-2026-45498 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added May 20, 2026.

Description

Microsoft Defender Denial of Service Vulnerability

References (2)

Core 2
Core References
Vendor Advisory vendor-advisory patch
Microsoft Defender Denial of Service Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498

Scores

CVSS v3 4.0
EPSS 0.0250
EPSS Percentile 82.6%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation active
Automatable no
Technical Impact partial

Details

CISA KEV 2026-05-20
VulnCheck KEV 2026-05-19
ENISA EUVD EUVD-2026-31102
CWE
CWE-400
Status published
Products (3)
microsoft/defender_antimalware_platform 4.18.26030.3011 - 4.18.26040.7
Microsoft/Microsoft Defender Antimalware Platform -
Microsoft/Microsoft Defender Antimalware Platform 4.0.0.0 - 4.18.26040.7
Published May 20, 2026
KEV Added May 20, 2026
Tracked Since May 20, 2026