CVE-2026-21537

HIGH
2026-02-10 [email protected]
8.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 22:02 vuln.today
CVE Published
Feb 10, 2026 - 18:16 nvd
HIGH 8.8

Tags

Microsoft Linux Code Injection Defender For Endpoint

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.

Analysis

Microsoft Defender for Endpoint on Linux contains a code injection vulnerability that enables adjacent network attackers to execute arbitrary code without authentication. The flaw affects multiple platforms and carries high severity (CVSS 8.8) with no patch currently available. …

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Remediation

Within 24 hours: Identify and inventory all Linux systems running Microsoft Defender; assess network exposure by documenting adjacent network access points and data sensitivity of affected systems. Within 7 days: Implement network segmentation to restrict adjacent network access to affected Linux hosts; disable Microsoft Defender if operationally feasible pending patch availability; increase monitoring for suspicious process execution on affected systems. …

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Priority Score

44
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +44
POC: 0

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CVE-2026-21537 vulnerability details – vuln.today
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