CVE-2026-55011CWE-191

Microsoft Defender Remote Code Execution Vulnerability

High · published July 14, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
39.4
In the wild
Unconfirmed
What it is

Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.00466 · 39.4th percentile
Weakness
CWE-191 · Integer Underflow (Wrap or Wraparound)
Published
2026-07-14T17:05Z
EPSS history
Timeline
  • 14 JUL 17:05Z
    Microsoft Defender Remote Code Execution Vulnerability
    cvelistv5