CVE-2026-45498 | BDVDB-2026-334255 Detail

MicrosoftMicrosoft Defender Antimalware Platform

Description#

Microsoft Defender Denial of Service Vulnerability

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact none, availability impact low. Attack vector: local.

Weaknesses#

CWE-400 Uncontrolled Resource Consumption

References#

Exploit#

No public exploit known

History#

Version 12026-05-20Record published in the CVE List.
Version 22026-08-10Most recent update recorded in the CVE List.

Published

Published: 2026-05-20
Last modified: 2026-08-10

Vendor information

Vendor: Microsoft
Product: Microsoft Defender Antimalware Platform

All Microsoft vulnerabilities

Score

4.0 Medium

EPSS

63.0%, High

Estimated chance of exploitation in the next 30 days. EPSS percentile: 99.2.

KEV

Yes

Listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Denial of Service

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.

Affected Systems

Vulnerable
>= 4.0.0.0 and < 4.18.26040.7
Fixed
4.18.26040.7

Scoring System

CVSS v4.0

Not available

CVSS v3.1

4.0 Medium

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C

Metric breakdown
Attack Vector	Local
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	None
Availability	Low

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).