VDB-364877 · CVE-2026-45498 · EUVD-2026-31102

Microsoft Defender Antimalware Platform UnDefend denial of service

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.9	$0-$5k	0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Microsoft Defender Antimalware Platform. The impacted element is an unknown function. The manipulation leads to denial of service. This vulnerability is uniquely identified as CVE-2026-45498. Local access is required to approach this attack. Moreover, an exploit is present.

Detailsinfo

A vulnerability was found in Microsoft Defender Antimalware Platform (affected version not known). It has been rated as problematic. This issue affects some unknown functionality. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability.

The advisory is shared at msrc.microsoft.com. The identification of this vulnerability is CVE-2026-45498 since 05/12/2026. The exploitation is known to be easy. An attack has to be approached locally. Technical details are unknown but an exploit is available.

It is declared as attacked. The vulnerability scanner Nessus provides a plugin with the ID 316484 (Windows Defender < 4.18.26040.7 DoS (CVE-2026-45498)), which helps to determine the existence of the flaw in a target environment. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 05/20/2026 with a due date of 06/03/2026:

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

The vulnerability is also documented in the databases at Zero-Day.cz (1100), Tenable (316484) and EUVD (EUVD-2026-31102). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Anti-Malware Software

Vendor

Microsoft

Name

Defender Antimalware Platform

License

commercial

Website

Vendor: https://www.microsoft.com/

CPE 2.3info

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CPE 2.2info

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CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.9

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CNA Base Score: 4.0
CNA Vector (microsoft): 🔒

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔒
Status: Attacked

EPSS Score: 🔒
EPSS Percentile: 🔒

KEV Added: 🔒
KEV Due: 🔒
KEV Remediation: 🔒
KEV Ransomware: 🔒
KEV Notice: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 316484
Nessus Name: Windows Defender < 4.18.26040.7 DoS (CVE-2026-45498)

Zero-Day.cz: 🔒

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

05/12/2026 CVE reserved
05/20/2026 +8 days Advisory disclosed
05/20/2026 +0 days VulDB entry created
05/30/2026 +10 days VulDB entry last update

Sourcesinfo

Vendor: microsoft.com

Advisory: msrc.microsoft.com
Status: Confirmed

CVE: CVE-2026-45498 (🔒)
GCVE (CVE): GCVE-0-2026-45498
GCVE (VulDB): GCVE-100-364877
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 05/20/2026 15:40
Updated: 05/30/2026 06:35
Changes: 05/20/2026 15:40 (60), 05/20/2026 22:14 (13), 05/21/2026 01:40 (1), 05/22/2026 16:12 (2), 05/22/2026 22:38 (2), 05/23/2026 22:24 (11), 05/30/2026 06:35 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.