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Vulnerabilities

CVE-2026-21224

High
Stack-based buffer overflow in Azure Connected Machine Agent allows an authorized attacker to elevate privileges locally.
CWE-121 — Weakness Type
Published: Jan 13, 2026  ·  Modified: Feb 28, 2026  ·  Source: NVD
CVSS v3
7.8
🔗 NVD Official
📄 Description (English)

Stack-based buffer overflow in Azure Connected Machine Agent allows an authorized attacker to elevate privileges locally.

🤖 AI Executive Summary

CVE-2026-21224 is a stack-based buffer overflow vulnerability in Microsoft Azure Connected Machine Agent that allows authenticated local attackers to escalate privileges. With a CVSS score of 7.8 and no public exploit currently available, this poses a significant risk to organizations managing hybrid cloud infrastructure. Immediate patching is critical for Saudi enterprises leveraging Azure hybrid connectivity for government, banking, and energy sectors.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 28, 2026 12:05
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability directly impacts Saudi organizations in critical sectors: (1) Banking & Financial Services — SAMA-regulated institutions using Azure hybrid deployments for core banking systems; (2) Government & Public Sector — NCA-supervised entities managing citizen data and e-government services; (3) Energy Sector — ARAMCO and downstream operators using Azure for SCADA/ICS monitoring; (4) Telecommunications — STC and other telecom providers managing network infrastructure; (5) Healthcare — MOHSR-regulated hospitals using Azure for patient data management. Local privilege escalation could lead to unauthorized access to sensitive data, system compromise, and regulatory violations under SAMA CSF and NCA ECC frameworks.
🏢 Affected Saudi Sectors
Banking & Financial Services Government & Public Administration Energy & Utilities Telecommunications Healthcare Critical Infrastructure
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Inventory all Azure Connected Machine Agent deployments across hybrid environments using Azure Arc inventory tools
2. Restrict local administrative access and implement principle of least privilege for service accounts
3. Enable Azure Arc security monitoring and audit logging for privilege escalation attempts

PATCHING GUIDANCE:
1. Apply Microsoft security update for Azure Connected Machine Agent immediately (patch available)
2. Test patches in non-production environments first, particularly for critical infrastructure
3. Prioritize patching for systems with sensitive data access or administrative privileges
4. Verify patch deployment using Azure Update Management or Configuration Management tools

COMPENSATING CONTROLS (if immediate patching delayed):
1. Implement application whitelisting to restrict execution of unauthorized binaries
2. Enable Windows Defender Application Guard on affected systems
3. Restrict local logon rights and disable unnecessary service accounts
4. Monitor process creation and memory access patterns for exploitation attempts

DETECTION RULES:
1. Monitor for abnormal stack memory access patterns in Azure Connected Machine Agent processes
2. Alert on privilege escalation attempts from service accounts running the agent
3. Track modifications to system binaries or DLL injection attempts targeting the agent
4. Monitor for unexpected child processes spawned by the agent with elevated privileges
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حصر جميع نشرات وكيل Azure Connected Machine عبر البيئات الهجينة باستخدام أدوات جرد Azure Arc
2. تقييد الوصول الإداري المحلي وتطبيق مبدأ الامتياز الأقل للحسابات الخدمية
3. تفعيل مراقبة أمان Azure Arc وتسجيل التدقيق لمحاولات تصعيد الامتيازات

إرشادات التصحيح:
1. تطبيق تحديث أمان مايكروسوفت لوكيل Azure Connected Machine فورًا (التصحيح متاح)
2. اختبار التصحيحات في بيئات غير الإنتاج أولاً، خاصة للبنية التحتية الحرجة
3. إعطاء الأولوية لتصحيح الأنظمة ذات الوصول إلى البيانات الحساسة أو الامتيازات الإدارية
4. التحقق من نشر التصحيح باستخدام أدوات إدارة التحديثات أو إدارة التكوين في Azure

الضوابط البديلة (إذا تأخر التصحيح الفوري):
1. تطبيق القائمة البيضاء للتطبيقات لتقييد تنفيذ الملفات الثنائية غير المصرح بها
2. تفعيل Windows Defender Application Guard على الأنظمة المتأثرة
3. تقييد حقوق تسجيل الدخول المحلي وتعطيل حسابات الخدمة غير الضرورية
4. مراقبة إنشاء العمليات وأنماط الوصول إلى الذاكرة لمحاولات الاستغلال

قواعد الكشف:
1. مراقبة أنماط الوصول غير الطبيعية للذاكرة المكدسة في عمليات وكيل Azure Connected Machine
2. تنبيهات محاولات تصعيد الامتيازات من حسابات الخدمة التي تشغل الوكيل
3. تتبع التعديلات على الملفات الثنائية للنظام أو محاولات حقن DLL التي تستهدف الوكيل
4. مراقبة العمليات الفرعية غير المتوقعة التي يتم إنشاؤها بواسطة الوكيل بامتيازات مرتفعة
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1.1 — Access Control Policies (privilege escalation prevention) ECC 2024 A.8.1.1 — Asset Management (inventory and patch management) ECC 2024 A.12.2.1 — Change Management (security patch deployment) ECC 2024 A.12.6.1 — Management of Technical Vulnerabilities
🔵 SAMA CSF
SAMA CSF ID.AM-2 — Asset Management (Azure agent inventory) SAMA CSF PR.AC-1 — Access Control (privilege escalation prevention) SAMA CSF PR.MA-2 — Maintenance (patch management) SAMA CSF DE.CM-8 — Vulnerability Scanning and Management
🟡 ISO 27001:2022
ISO 27001:2022 A.5.15 — Access Control (privilege management) ISO 27001:2022 A.8.1 — Asset Management (software asset management) ISO 27001:2022 A.8.2 — Information Security Incident Management ISO 27001:2022 A.14.2 — System Development and Maintenance (vulnerability management)
🟣 PCI DSS v4.0.1
PCI DSS 6.2 — Security patches and updates (if payment systems connected) PCI DSS 7.1 — Restrict access to cardholder data (privilege escalation risk)
📦 Affected Products / CPE 1 entries
microsoft:azure_connected_machine_agent
📊 CVSS Score
7.8
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack VectorL — Low / Local
Attack ComplexityL — Low / Local
Privileges RequiredL — Low / Local
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityH — High
IntegrityH — High
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score7.8
CWECWE-121
EPSS0.06%
Exploit No
Patch ✓ Yes
Published 2026-01-13
Source Feed nvd
Views 3
🇸🇦 Saudi Risk Score
8.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
CWE-121
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