CVE-2026-21537: CWE-94: Improper Control of Generation of Code ('Code Injection') in Microsoft Microsoft Defender for Endpoint for Linux
Improper control of generation of code ('code injection') in Microsoft Defender for Linux allows an unauthorized attacker to execute code over an adjacent network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-21537) involves improper control of code generation (CWE-94) in Microsoft Defender for Endpoint for Linux, enabling an attacker on an adjacent network to execute arbitrary code without privileges or user interaction. It has a CVSS 3.1 base score of 8.8, reflecting high impact on confidentiality, integrity, and availability. The vendor has published an official fix to remediate the issue.
Potential Impact
Successful exploitation could lead to full compromise of the affected system, including unauthorized code execution with high impact on confidentiality, integrity, and availability. The attacker requires network adjacency but no privileges or user interaction. No active exploits have been reported.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the vendor-provided patch as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21537 to remediate this vulnerability.
CVE-2026-21537: CWE-94: Improper Control of Generation of Code ('Code Injection') in Microsoft Microsoft Defender for Endpoint for Linux
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-21537) involves improper control of code generation (CWE-94) in Microsoft Defender for Endpoint for Linux, enabling an attacker on an adjacent network to execute arbitrary code without privileges or user interaction. It has a CVSS 3.1 base score of 8.8, reflecting high impact on confidentiality, integrity, and availability. The vendor has published an official fix to remediate the issue.
Potential Impact
Successful exploitation could lead to full compromise of the affected system, including unauthorized code execution with high impact on confidentiality, integrity, and availability. The attacker requires network adjacency but no privileges or user interaction. No active exploits have been reported.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the vendor-provided patch as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21537 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-30T18:10:54.848Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21537","vendor":"Microsoft"}]
Threat ID: 698b76074b57a58fa120a6c8
Added to database: 2/10/2026, 6:16:39 PM
Last enriched: 5/12/2026, 5:16:25 AM
Last updated: 5/22/2026, 5:07:17 PM
Views: 245
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