CVE-2026-21537

Name: CVE-2026-21537
Creator: NVD / NIST
Published: 2026-02-10T18:16:35.97+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.53%

Last modified Jun 17, 2026

CVE-2026-21537 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Improper control of generation of code ('code injection') in Microsoft Defender for Linux allows an unauthorized attacker to execute code over an adjacent network.. EPSS estimates a 0.53% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.53%

40.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-94

Affected Software

Vendor	Product	Versions
Microsoft	Defender For Endpoint	All versions

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21537Vendor Advisory

Timeline

Published: Feb 10, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is 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.

How severe is CVE-2026-21537?

CVE-2026-21537 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.53% probability of exploitation in the next 30 days.

How do I fix CVE-2026-21537?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-21537?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST