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Defender For Endpoint CVE-2026-21537

HIGH
Code Injection (CWE-94)
2026-02-10 secure@microsoft.com
Microsoft Linux Code Injection Defender For Endpoint
8.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
8.8 HIGH
AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

DescriptionCVE.org

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

AnalysisAI

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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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Position on adjacent network
Exploit
Send malicious network packet
Execution
Trigger code injection in Defender parser
Impact
Execute arbitrary code with Defender privileges
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Vulnerability AssessmentAI

Exploitation Attacker must be on the same adjacent network segment as the target running Microsoft Defender for Linux. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 8.8 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A remote attacker without authentication could exploit this vulnerability to compromise the affected system.
Remediation Monitor vendor advisories for a patch. Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

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. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-21537 vulnerability details – vuln.today
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