CVE-2026-21537: high-severity vulnerability in Microsoft Defender for Endpoint for Linux
Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 0.5%
Improper control of generation of code ('code injection') in Microsoft Defender for Linux allows an unauthorized attacker to execute code over an adjacent network.
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
Affected products
Microsoft · Microsoft Defender for Endpoint for LinuxRelated CVEs — Microsoft Defender for Endpoint for Linux
In the same product, most dangerous first.
CVE-2022-23278MEDIUMMicrosoft Defender for Endpoint Spoofing VulnerabilityEPSS 1.9%CVE-2022-33637MEDIUMMicrosoft Defender for Endpoint Tampering VulnerabilityEPSS 1.7%CVE-2025-47161HIGHMicrosoft Defender for Endpoint Elevation of Privilege VulnerabilityEPSS 0.8%CVE-2024-43614MEDIUMMicrosoft Defender for Endpoint for Linux Spoofing VulnerabilityEPSS 0.6%CVE-2025-26684MEDIUMMicrosoft Defender Elevation of Privilege VulnerabilityEPSS 0.4%CVE-2025-59497HIGHMicrosoft Defender for Linux Denial of Service VulnerabilityEPSS 0.2%