CVE-2026-45498 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-45498HIGH

Microsoft Defender Denial of Service Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .6308   99.1   YES

AFFECTED
  Product                                  Versions   Fixed
  Microsoft Defender Antimalware Platform  4.0.0.0 –  —

TIMELINE
  May 12  Reserved by microsoft
  May 20  Added to CISA KEV, remediation due 2026-06-03
  May 20  Published (CNA: microsoft)
  Jun 4   DUE DATE PASSED — CVE-2026-45498 (Microsoft Defender Antimalware Platform). CISA remediation deadline was June 3, 2026; still in catalog.
  Jul 23  ENRICHED — CVE-2026-45498 (Microsoft Defender). Received CVSS 7.5 and CPE data from NVD.

CWE-400 · CNA: microsoft · CVSS v3.1 · 2 references · NVD status: Analyzed · KEV due June 3, 2026

Description

Microsoft Defender Denial of Service Vulnerability

Lifecycle

Complete event history — 5 events, chronological
Date	Event	Detail
May 12, 2026	Reserved	Reserved by microsoft
May 20, 2026	KEV ADDED	Added to CISA KEV, remediation due 2026-06-03
May 20, 2026	Published	Published (CNA: microsoft)
June 4, 2026	DUE DATE PASSED	DUE DATE PASSED — CVE-2026-45498 (Microsoft Defender Antimalware Platform). CISA remediation deadline was June 3, 2026; still in catalog.
July 23, 2026	ENRICHED	ENRICHED — CVE-2026-45498 (Microsoft Defender). Received CVSS 7.5 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Microsoft Defender Antimalware Platform	—	4.0.0.0	—

Weaknesses

CWE-400

References (2)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498 [Vendor Advisory]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45498 [Third Party Advisory, US Government Resource]

Authoritative record: CVE-2026-45498 at cve.org

Vendors: microsoft

Weaknesses: CWE-400

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-45498 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.