CVE-2026-21537

HIGH

Microsoft Defender for Endpoint for Linux 101.0.0-1.0.8.9 - Unauthenticated Remote Code Execution

Title source: llm

Description

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

References (1)

Core 1

Core References

Vendor Advisory vendor-advisory patch

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21537

Scores

CVSS v3 8.8

EPSS 0.0009

EPSS Percentile 25.2%

Attack Vector ADJACENT_NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-94

Status published

Products (2)

microsoft/defender_for_endpoint

Microsoft/Microsoft Defender for Endpoint for Linux 101.0.0 - 1.0.9.0

Published Feb 10, 2026

Tracked Since Feb 18, 2026