CVE-2026-45584 HIGH

CVE-2026-45584: Microsoft Defender Remote Code Execution Vulnerability

Vendor Microsoft
Product Microsoft Malware Protection Engine
Weakness CWE-122
Published May 20, 2026
Last update June 9, 2026
View on NVD All CVEs

CVSS base score

8.1/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

May 20, 2026 CVE published
June 9, 2026 Record updated