What’s Vulnerable › Vulnerabilities
CVE-2026-21537: Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability
- Severity: high (CVSS 8.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-02-10 · updated 2026-08-19
- Weakness: CWE-94
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.
Affected products
- Microsoft Defender for Endpoint for Linux: all versions
- Microsoft Defender for Endpoint for Linux: from 101.0.0 before 1.0.9.0 — fixed in 1.0.9.0
How to fix
Upgrade to a fixed version: Microsoft Defender for Endpoint for Linux 1.0.9.0. Check the vendor advisory for mitigations.
References
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