CVE-2026-21537 HIGH

CVE-2026-21537: Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability

Vendor Microsoft
Product Microsoft Defender for Endpoint for Linux
Weakness CWE-94 · Code injection
Published February 10, 2026
Last update May 11, 2026
View on NVD All CVEs

CVSS base score

8.8/10
Attack vector Adjacent
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

Improper control of generation of code ('code injection') in Microsoft Defender for Linux allows an unauthorized attacker to execute code over an adjacent network.

Key dates

02Disclosure timeline

February 10, 2026 CVE published
May 11, 2026 Record updated