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HIGH · 8.8

CVE-2026-21537

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

Vulnerability 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.

CVSS Score

8.8

HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
MicrosoftDefender For Endpoint-

Related Weaknesses (CWE)

CWE-94

References

FAQ

What is CVE-2026-21537?

CVE-2026-21537 is a vulnerability with a CVSS score of 8.8 (HIGH). Improper control of generation of code ('code injection') in Microsoft Defender for Linux allows an unauthorized attacker to execute code over an adjacent network.

How severe is CVE-2026-21537?

CVE-2026-21537 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-21537?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Defender For Endpoint.