Denial of Service Vulnerability in Microsoft Defender by Microsoft
CVE-2026-45498

4MEDIUM

Key Information:

Vendor

Microsoft
Status
Microsoft Defender Antimalware Platform
Vendor
CVE Published:
20 May 2026

What is CVE-2026-45498?

A vulnerability in Microsoft Defender allows attackers to cause a denial of service. An unauthenticated user may exploit this issue to disrupt service functionality, potentially leading to operational interruptions. It is crucial for users of Microsoft Defender to apply relevant patches and updates to mitigate the risk associated with this vulnerability.

Affected Version(s)

Microsoft Defender Antimalware Platform -

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
4
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.