CVE-2026-45584CWE-122

Microsoft Defender Remote Code Execution Vulnerability

High · published May 20, 2026

CVSS v3.1
8.1
EPSS
1%
Percentile
52.9
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
8.1 · HIGH
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
CVSS v4.0
Not supplied
EPSS
0.00707 · 52.9th percentile
Weakness
CWE-122 · Heap-based Buffer Overflow
Published
2026-05-20T13:09Z
EPSS history
Timeline
  • 20 MAY 13:09Z
    Microsoft Defender Remote Code Execution Vulnerability
    cvelistv5