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CVE-2026-45584

38
FAUCET Score

Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.

First published: May 20, 2026Last modified: May 26, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.1.26030.3008, < 1.1.26040.8CPE matchmatch criteria
cpe:2.3:a:microsoft:malware_protection_engine:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.85%
Probability of exploitation in next 30 days
EPSS Percentile
54.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0085 is in the 22nd percentile among its peer group of 8,918 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

microsoftpatch availablevia msrc
Product: Microsoft Malware Protection EngineFixed in: 1.1.26040.8
microsoftvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

microsoft2026-May/CVE-2026-45584Critical

Microsoft Defender Remote Code Execution Vulnerability

May 12, 2026

References

msrc.microsoft.com / update-guide/vulnerability/CVE-2026-45584
Vendor Advisory