CVE-2026-21537

Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability

Published Feb 10, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
CPEs cpe:2.3:a:microsoft:defender_for_endpoint:-:*:*:*:*:linux:*:*
Type Values Removed Values Added
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.
Title Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability
First Time appeared Microsoft
Microsoft defender For Endpoint
Weaknesses CWE-94
CPEs cpe:2.3:a:microsoft:defender_for_endpoint:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft defender For Endpoint
References
Metrics cvssV3_1

{'score': 8.8, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
microsoft
Published
Updated
Aug 19, 2026, 4:26 PM
Reserved
Dec 30, 2025, 6:10 PM
Status
Analyzed
Published
Feb 10, 2026, 6:16 PM
Modified
Jun 17, 2026, 10:18 AM