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CVE-2026-21537

Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability

HIGH
8.8
CVSS Score
Published: February 10, 2026 at 05:51 PM UTC
Updated: June 17, 2026 at 10:18 AM UTC
1 product affected across 1 vendorDefender for Endpoint

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Severity
HIGH8.8
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Defender for Endpoint· Microsoft
95%
101.0.0 ≤ v < 1.0.9.0101.0.0
Affected range stops below 1.0.9.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21537

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-94

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