Feb 2026: Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability
CVE-2026-21537 Published on February 10, 2026
Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability
Improper control of generation of code ('code injection') in Microsoft Defender for Linux allows an unauthorized attacker to execute code over an adjacent network.
Weakness Type
What is a Code Injection Vulnerability?
The software constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
CVE-2026-21537 has been classified to as a Code Injection vulnerability or weakness.
Products Associated with CVE-2026-21537
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Affected Versions
Microsoft Defender for Endpoint for Linux:- Version 101.0.0 and below 1.0.9.0 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.