Microsoft Defender Denial of Service Vulnerability

Technical Severity

CVSS v3.1 Metrics

MEDIUM

4 / 10

Minimal Risk Critical

Vector Specification

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploitation Likelihood

EPSS Prediction

2.77 %

Predictive Probability

Percentile Rank

86.2 th

Documented as more likely to be exploited than 86.2% of known CVEs.

Detection Date

May 20, 2026

Remediation Due

Jun 03, 2026

CISA Catalog Active

Threat Analysis

Microsoft Defender contains an unspecified vulnerability that allows for denial of service.

Remediation Directive

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

External Intelligence

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

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2026-45498