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CVE-2026-21537

Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability

Published: Feb 10, 2026Updated: Feb 11, 2026 Sources: CVE List NVD BDUCWE-94
8.8HIGH
NVD MITRE
EPSS Score
0.5%
Top 59.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:AAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:AAttack Vector
Adjacent
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-94

Affected Products

Microsoft Corp
commercial·USaka microsoft, microsoft corporation
defender for endpointOn-premSecurity Product
Security Products / endpoint-av-edr
Microsoft Defender for Endpoint for LinuxOn-prem
Operating Systems / windows
Microsoft Defender for EndpointOn-premSecurity Product
Security Products / endpoint-av-edr

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21537
msrc.microsoft.com
News mentions
1

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