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.
CVSS v3.1
Score 8.8high
Affected software
Microsoft
Microsoft Defender for Endpoint for Linux
Weaknesses
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: 02/10/2026, 18:16:39 UTC
Last enriched: 05/12/2026, 05:16:25 UTC
Last updated: 09/10/2026, 22:11:41 UTC
Views: 384
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.