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CVE-2026-45498

Microsoft Defender Denial of Service Vulnerability

Published: May 20, 2026Updated: May 20, 2026 Sources: CVE List NVD
NVD MITRE
4.0CVSS
MEDIUM

Microsoft Defender Denial of Service Vulnerability

EPSS Score
N/A
CISA KEV
Active Exploitation
Since May 20, 2026
Exploits
No Known Exploits
Remediation
Patch Available

CVSS Vector Breakdown

AV:LAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low

Weaknesses

NVD-CWE-noinfoCWE-400

Affected Products

defender antimalware platform
microsoft
Microsoft Defender Antimalware Platform
Microsoft

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:May 20, 2026
Remediation due:Jun 3, 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.

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498
msrc.microsoft.com
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45498
cisa.gov

Timeline

Added to CISA KEV
May 20, 2026
Published
May 20, 2026
Last Updated
May 20, 2026

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