Vulnerability Intelligence Report
Microsoft Defender Denial of Service Vulnerability
CVE-2026-45498
Microsoft Defender Denial of Service Vulnerability
CISA KEV
SSVC: Active Exploitation
CVSS Base Score
4.0
MEDIUM
Exploitability:2.6
Impact Score:1.5
EPSS Probability:63.08%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-400 ↗CWE-400: Uncontrolled Resource Consumption
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Microsoft | Microsoft Defender Antimalware Platform | 4.0.0.0 < 4.18.26040.7 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Microsoft Corporation · Vendor · USA |
| Reserved | 2026-05-12T16:07:22 |
| Published | 2026-05-20T13:09:12 |
| Patch Date | 2026-05-19 |
| Last Updated | 2026-08-10T15:13:18 |
Community Chatter & Buzz