CVE-2026-21537

highpriority · track · 0EPSS 0.005 · 44 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.53% (44th) EPSS

CVSS 8.8 · high

Is it mine?

6 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-22

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

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedMicrosoft Defender for Endpoint for Linuxmsrc_csaf
1.0.9.0:Security Update:https://learn.microsoft.com/en-us/azure/defender-for-cloud/integration-defender-for-endpoint?WT.mc_id=Portal-Microsoft_Azure_Security
https://learn.microsoft.com/en-us/azure/defender-for-cloud/integration-defender-for-endpoint?WT.mc_id=Portal-Microsoft_Azure_Security

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.18.8highAV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · ENISA EU

v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · secure@microsoft.com USexploitability 2.8 · impact 5.9

v3.18.1highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-94USCWE-94USCWE-94US

affected products (6)

Products and version ranges known to be affected.

Microsoft Defender for Endpoint for Linuxall versionscert_bundDEcpe:/a:microsoft:defender:for_endpoint_for_linux
Microsoft Microsoft Defender for Endpoint for Linux101.0.0 → 1.0.9.0enisa_euvdEU
Microsoft Corp Microsoft Defender for Endpoint≤ 1.0.9.0fstec_bduRU
Microsoft Defender for Endpoint for Linuxall versionsfixedmsrc_csafUS
Microsoft Defender for Endpoint for Linux< 1.0.9.0msrc_csafUS
microsoft defender for endpointall versionsnvdUScpe:2.3:a:microsoft:defender_for_endpoint:*:*:*:*:*:*:*:*

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-0364Microsoft Defender für Endpoint Linux Extension: Schwachstelle ermöglicht Ausführen von beliebigem Programmcode mit AdministratorrechtenDeutsch2026-02-10csaf · cert_bundDE
Ein Angreifer aus einem angrenzenden Netzwerk kann eine Schwachstelle in Microsoft Defender ausnutzen, um beliebigen Programmcode mit Administratorrechten auszuführen.
msrc_CVE-2026-21537Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability2026-02-10csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund msrc_csaf nvd NVD CVE.org MITRE

published 2026-02-10modified 2026-06-17

references (3)

External citations — patches, advisories, analysis.

scry

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